Piensa el sentimiento, siente el pensamiento." (roughly translated, "Think about the emotional and feel the intellectual")

If a person never contradicts himself, it must be that he says nothing.

A man does not die of love or his liver or even of old age; he dies of being a man.

The moment love is equated with happiness, it is satisfied — and is no longer love. The satisfied, the happy ones, do not love; they fall asleep in habit, near neighbor to annihilation.

Love personalizes all that it loves. Only by personalizing it can we fall in love with an idea.

True science teaches, above all, to doubt and be ignorant.

My religion is to seek for truth in life and for life in truth, even knowing that I shall not find them while I live.