We may know ourselves, and yet even with all the efforts we make, we do not know ourselves. We know our fellowman, and yet we do not know him, because we are not a thing, and our fellowman is not a thing. The further we reach into the depths of our being, on someone else's being, the more the goal of knowledge eludes us.

I feel worried, deeply worried, only about one thing - the possibility that we fall... that we cannot avoid an atomic war.

Man represses the irrational passions of destructiveness, hate, envy, revenge; he worships power, money, the sovereign state, the nation; while he pays lip service to the teachings of the great spiritual leaders of the human race, those of Buddha, the prophets, Socrates, Jesus, Mohammed-he has transformed these teachings into a jungle of superstition and idol-worship. How can mankind save itself from destroying itself by this discrepancy between intellectual-technical overmaturity and emotional backwardness?

Man is the only animal for whom his own existence is a problem which he has to solve.

Faith is not a weak form of belief or knowledge; it is not faith in this or that; faith is the conviction about the not yet proven, the knowledge of the real possibility, the awareness of pregnancy.

Love is the active concern for the life and the growth of that which we love.

If one is not productive in other spheres, one is not productive in the love either.