Solitude is the profoundest fact of the human condition. Man is the only being who knows he is alone.

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The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool the truest heroism is, to resist the doubt and the profoundest wisdom, to know when it ought to be resisted, and when to be obeyed.

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It is ever the invisible that is the object of our profoundest worship. With the lover it is not the seen but the unseen that he muses upon.

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A knowledge of the existence of something we cannot penetrate, our perceptions of the profoundest reason and the most radiant beauty, which only in their most primitive forms are accessible to our minds: it is this knowledge and this emotion that constitute true religiosity. In this sense, and only this sense, I am a deeply religious man.

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I know my fate. One day there will be associated with my name the recollection of something frightful -- of a crisis like no other before on earth, of the profoundest collision of conscience, of a decision evoked against everything that until then had been believed in, demanded, sanctified. I am not a man I am dynamite.

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The profoundest thought or passion sleeps as in a mine, until an equal mind and heart finds and publishes it.

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Religions that teach brotherly love have been used as an excuse for persecution, and our profoundest scientific insight is made into a means of mass destruction.

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