To prove cannot mean anything other than to bring the other person to my own conviction. The truth lies only in the unification of “I” and “You.” The Other of pure thought, however, is the sensuous intellect in general. In the field of philosophy, proof therefore consists only in the fact that the contradiction between sensuous intellect and pure thought is disposed, so that thought is true not only for itself but also for its opposite.

Though I myself am an atheist, I openly profess religion in the sense just mentioned, that is, a nature religion. I hate the idealism that wrenches man out of nature; I am not ashamed of my dependency on nature; I openly confess that the workings of nature affect not only my surface, my skin, my body, but also my core, my innermost being, that the air I breathe in bright weather has a salutary effect not only on my lungs but also on my mind, that the light of the sun illumines not only my eyes but also my spirit and my heart. And I do not, like a Christian, believe that such dependency is contrary to my true being or hope to be delivered from it. I know further that I am a finite moral being, that I shall one day cease to be. But I find this very natural and am therefore perfectly reconciled to the thought.

Christianity set itself the goal of fulfilling man’s unattainable desires, but for that very reason ignored his attainable desires. By promising man eternal life, it deprived him of temporal life, by teaching him to trust in God’s help it took away his trust in his own powers; by giving him faith in a better life in heaven, it destroyed his faith in a better life on earth and his striving to attain such a life. Christianity gave man what his imagination desires, but for that very reason failed to give him what he really and truly desires.

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Religion is the dream of the human mind. But even in dreams we do not find ourselves in emptiness or in heaven, but on earth, in the realm of reality; we only see real things in the entrancing splendor of imagination and caprice, instead of in the simple daylight of reality and necessity.

Religion is indeed essential to or innate in man, but … this is not the religion of theology or theism, not an actual belief in God, but solely the religion that expresses nothing other than man’s feeling of finiteness and dependency on nature. … I distinguish religion from theism, the belief in a being distinct from nature and man. … Today theism, theology, the belief in God have become so identified with religion that to have no God, to theological being, is considered synonymous with having no religion. But here we deal with the original elements of religion. It is theism, theology, that has wrenched man out of his relationship with the world, isolated him, made him into an arrogant self-centered being who exalts himself above nature. And it is only on this level that religion becomes identified with theology, with the belief in a being outside and above nature as the true God. Originally religion expressed nothing other than man’s feeling that he is an inseparable part of nature or the world.

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To be sure, the human individual can, even must, feel and know himself to be limited—and this is what distinguishes him from the animal—but he can become conscious of his limits, his finite-ness, only because he can make the perfection and infinity of his species the object either of his feeling, conscience, or thought. But if his limitations appear to him as emanating from the species, this can only be due to his delusion that he is identical with the species, a delusion intimately linked with the individual’s love of ease, lethargy, vanity, and selfishness; for a limit which I know to be mine alone, humiliates, shames, and disquiets me. Hence, in order to free myself of this feeling of shame, this uneasiness, I make the limits of my individuality the limits of man’s being itself. What is incomprehensible to me is incomprehensible to others; why should this worry me at all? It is not due to any fault of mine or of my understanding: the cause lies in the understanding of the species itself. But it is a folly, a ludicrous and frivolous folly to designate that which constitutes the nature of man and the absolute nature of the individual, the essence of the species, as finite and limited.

A subject interests me and holds my attention only so long as it presents me with difficulties, only so long as I am at odds with it and have, as it were, to struggle with it; but once I have mastered it I hurry on to something else, to a new subject; for my interest is not confined to any particular field or subject; it extends to everything human. This does not mean that I am an intellectual miser or egoist, who amasses knowledge for himself alone; by no means! What I do and think for myself, I must also think and do for others. But I feel the need of instructing others in a subject only so long as, while instructing others, I am also instructing myself.

I have always taken as the standard of the mode of teaching and writing, not the abstract, particular, professional philosopher, but universal man, that I have regarded man as the criterion of truth, and not this or that founder of a system, and have from the first placed the highest excellence of the philosopher in this, that he abstains, both as a man and as an author, from the ostentation of philosophy, i.e., that he is a philosopher only in reality, not formally, that he is a quiet philosopher, not a loud and still less a brawling one.

If therefore my work is negative, irreligious, atheistic, let it be remembered that atheism — at least in the sense of this work — is the secret of religion itself; that religion itself, not indeed on the surface, but fundamentally, not in intention or according to its own supposition, but in its heart, in its essence, believes in nothing else than the truth and divinity of human nature.