Descartes tells us that philosophizing is based on the judgment: "I think, therefore I am." From this meagre and arbitrarily selected beginning it is inevitable that it should wander into the path of the abstract. It does not find the entrance to the ethical realm, and remains held fast in a dead view of the world and of life. True philosophy must commence with the most immediate and comprehensive facts of consciousness. And this may be formulated as follows: "I am life which wills to live, and I exist in the midst of life which wills to live." This is no mere excogitated subtlety. Day after day and hour after hour I proceed on my way invested in it. In every moment of reflection it forces itself on me anew. A living world- and life-view, informing all the facts of life, gushes forth from it continually, as from an eternal spring. A mystically ethical oneness with existence grows forth from it unceasingly.

Just as in my own will-to-live there is a yearning for more life, and for that mysterious exaltation of the will-to-live which is called pleasure, and terror in face of annihilation and that injury to the will-to-live which is called pain; so the same obtains in all the will-to-live around me, equally whether it can express itself to my comprehension or whether it remains unvoiced.

Ethics thus consists in this, that I experience the necessity of practising the same reverence for life toward all will-to-live, as toward my own. Therein I have already the needed fundamental principle of morality. It is good to maintain and cherish life; it is evil to destroy and to check life.

As a matter of fact, everything which in the usual ethical valuation of inter-human relations is looked upon as good can be traced back to the material and spiritual maintenance or enhancement of human life and to the effort to raise it to its highest level of value. And contrariwise everything in human relations which is considered as evil, is in the final analysis found to be material or spiritual destruction or checking of human life and slackening of the effort to raise it to its highest value. Individual concepts of good and evil which are widely divergent and apparently unconnected fit into one another like pieces which belong together, the moment they are comprehended and their essential nature is grasped in this general notion.

The fundamental principle of morality which we seek as a necessity for thought is not, however, a matter only of arranging and deepening current views of good and evil, but also of expanding and extending these. A man is really ethical only when he obeys the constraint laid on him to help all life which he is able to succour, and when he goes out of his way to avoid injuring anything living. He does not ask how far this or that life deserves sympathy as valuable in itself, nor how far it is capable of feeling. To him life as such is sacred. He shatters no ice crystal that sparkles in the sun, tears no leaf from its tree, breaks off no flower, and is careful not to crush any insect as he walks. If he works by lamplight on a summer evening, he prefers to keep the window shut and to breathe stifling air, rather than to see insect after insect fall on his table with singed and sinking wings.

If he goes out into the street after a rainstorm and sees a worm which has strayed there, he reflects that it will certainly dry up in the sunshine, if it does not quickly regain the damp soil into which it can creep, and so he helps it back from the deadly paving stones into the lush grass. Should he pass by an insect which has fallen into a pool, he spares the time to reach it a leaf or stalk on which it may clamber and save itself.

He is not afraid of being laughed at as sentimental. It is indeed the fate of every truth to be an object of ridicule when it is first acclaimed. It was once considered foolish to suppose that coloured men were really human beings and ought to be treated as such. What was once foolishness has now become a recognized truth. Today it is considered as exaggeration to proclaim constant respect for every form of life as being the serious demand of a rational ethic. But the time is coming when people will be amazed that the human race was so long before it recognized thoughtless injury to life as incompatible with real ethics. Ethics is in its unqualified form extended responsibility with regard to everything that has life.

The general idea of ethics as a partaking of the mental atmosphere of reverence for life is not perhaps attractive. But it is the only complete notion possible. Mere sympathy is too narrow a concept to serve as the intellectual expression of the ethical element. It denotes, indeed, only a sharing of the suffering of the will-to-live. But to be ethical is to share the whole experience of all the circumstances and aspirations of the will-to-live, to live with it in its pleasures, in its yearnings, in its struggles toward perfection.

Love is a more inclusive term, since it signifies fellowship in suffering, in joy, and in effort. But it describes the ethical element only as it were by a simile, however natural and profound that simile may be. It places the solidarity created by ethics in analogy to that which nature has caused to come into being in a more or less superficial physical manner, and with a view to the fulfilment of their destiny, between two sexually attracted existences, or between these and their offspring.

Thought must strive to find a formula for the essential nature of the ethical. In so doing it is led to characterize ethics as self-devotion for the sake of life, motivated by reverence for life. Although the phrase "reverence for life" may perhaps sound a trifle unreal, yet that which it denotes is something which never lets go its hold of the man in whose thought it has once found a place. Sympathy, love, and, in general, all enthusiastic feeling of real value are summed up in it. It works with restless vitality on the mental nature in which it has found a footing and flings this into the restless activity of a responsibility which never ceases and stops nowhere. Reverence for life drives a man on as the whirling thrashing screw forces a ship through the water.

The ethic of reverence for life, arising as it does out of an inward necessity, is not dependent on the question as to how far or how little it is capable of development into a satisfactory view of life. It does not need to prove that the action of ethical men, as directed to maintaining, enhancing and exalting life, has any significance for the total course of the world-process. Nor is it disturbed by the consideration that the Preservation and enhancement of life which it practises are of almost no account at all beside the mighty destruction of life which takes place every moment as the result of natural forces. Determined as it is to act, it is yet able to ignore all the problems raised as to the result of its action. The fact that in the man who has become ethical a will informed by reverence for life and self-sacrifice for the sake of life exists in the world, is itself significant for the world.

The universal will-to-live experiences itself in my personal will-to-live otherwise than it does in other phenomena. For here it enters on an individualization, which, so far as I am able to gather in trying to view it from the outside, struggles only to live itself out, and not at all to become one with will-to-live external to itself. The world is indeed the grisly drama of will-to-live at variance with itself. One existence survives at the expense of another of which it yet knows nothing. But in me the will-to-live has become cognizant of the existence of other will-to-live. There is in it a yearning for unity with itself, a longing to become universal.

Why is it that the will-to-live has this experience only in myself? Is it a result of my having become capable of reflection about the totality of existence? Whither will the evolution lead which has thus begun in me?

There is no answer to these questions. It remains a painful enigma how I am to live by the rule of reverence for life in a world ruled by creative will which is at the same time destructive will, and by destructive will which is also creative.

I can do no other than hold on to the fact that the will-to-live appears in me as will-to-live which aims at becoming one with other will-to-live. This fact is the light which shines for me in the darkness. My ignorance regarding the real nature of the objective world no longer troubles me. I am set free from the world. I have been cast by my reverence for life into a state of unrest foreign to the world. By this, too, I am placed in a state of beatitude which the world cannot give. If in the happiness induced by our independence of the world I and another afford each other mutual help in understanding and in forgiveness, when otherwise will would harass other will, then the will-to-live is no longer at variance with itself. If I rescue an insect from a pool of water, then life has given itself for life, and again the self-contradiction of the will-to-live has been removed. Whenever my life has given itself out in any way for other life, my eternal will-to-live experiences union with the eternal, since all life is one. I possess a cordial which secures me from dying of thirst in the desert of life.

Therefore I recognize it as the destiny of my existence to be obedient to the higher revelation of the will-to-live which I find in myself. I choose as my activity the removal of the self-contradiction of the will-to-live, as far as the influence of my own existence extends. Knowing as I do the one thing needful, I am content to offer no opinion about the enigma of the objective world and my own being.

Thought becomes religious when it thinks itself out to the end. The ethic of reverence for life is the ethic of Jesus brought to philosophical expression, extended into cosmical form, and conceived as intellectually necessary.

The surmising and longing of all deeply religious personalities is comprehended and contained in the ethic of reverence for life. This, however, does not build up a world-view as a completed system, but resigns itself to leave the cathedral perforce incomplete. It is only able to finish the choir. Yet in this true piety celebrates a living and continuous divine service. . . .

What does reverence for life teach us about the relations of man and the nonhuman animals?

Whenever I injure life of any kind I must be quite clear as to whether this is necessary or not. I ought never to pass the limits of the unavoidable, even in apparently insignificant cases. The countryman who has mowed down a thousand blossoms in his meadow as fodder for his cows should take care that on the way home he does not, in wanton pastime, switch off the head of a single flower growing on the edge of the road, for in so doing he injures life without being forced to do so by necessity.

Those who test operations or drugs on animals, or who inoculate them with diseases so that they may be able to help human beings by means of the results thus obtained, ought never to rest satisfied with the general idea that their dreadful doings are performed in pursuit of a worthy aim. It is their duty to ponder in every separate case whether it is really and truly necessary thus to sacrifice an animal for humanity. They ought to be filled with anxious care to alleviate as much as possible the pain which they cause. How many outrages are committed in this way in scientific institutions where narcotics are often omitted to save time and trouble! How many also when animals are made to suffer agonizing tortures, only in order to demonstrate to students scientific truths which are perfectly well known. The very fact that the animal, as a victim of research, has in his pain rendered such services to suffering men, has itself created a new and unique relation of solidarity between him and ourselves. The result is that a fresh obligation is laid on each of us to do as much good as we possibly can to all creatures in all sorts of circumstances. When I help an insect out of his troubles all that I do 15 to attempt  to  remove some of the guilt contracted  through  these crimes against animals.

Wherever any animal is forced into the service of man, the sufferings which it has to bear on that account are the concern of every one of us. No one ought to permit, in so far as he can prevent it, pain or suffering for which he will not take the responsibility. No one ought to rest at ease in the thought that in so doing he would mix himself up in affairs which are not his business. Let no one shirk the burden of his responsibility. When there is so much maltreatment of animals, when the cries of thirsting creatures go up unnoticed from the railway trucks, when there is so much roughness in our slaughter-houses, when in our kitchens so many animals suffer horrible deaths from unskilful hands, when animals endure unheard-of agonies from heartless men, or are delivered to the dreadful play of children, then we are all guilty and must bear the blame.

We are afraid of shocking or offending by showing too plainly how deeply we are moved by the sufferings which man causes to the non-human creatures. We tend to reflect that others are more "rational" than we are, and would consider that which so disturbs us as customary and as a matter of course. And then, suddenly, they let fall some expression which shows us that they, too, are not really satisfied with the situation. Strangers to us hitherto, they are now quite near our own position. The masks, in which we had each concealed ourselves from the other, fall off. We now know that neither of us can cut ourselves free from the horrible necessity which plays ceaselessly around us. What a wonderful thing it is thus to get to know each other!

The ethic of reverence for life forbids any of us to deduce from the silence of our contemporaries that they, or in their case we, have ceased to feel what as thinking men we all cannot but feel. It prompts us to keep a mutual watch in this atmosphere of suffering and endurance, and to speak and act without panic according to the responsibility which we feel. It inspires us to join in a search for opportunities to afford help of some kind or other to the animals, to make up for the great amount of misery which they endure at our hands, and thus to escape for a moment from the inconceivable horrors of existence.