"In men of genius, sterile years precede productive years, these again to be followed by sterility, the barren periods being marked by psychological self-depreciation, by the feeling that they are less than other men; times in which the remembrance of the creative periods is a torment, and when they envy those who go about undisturbed by such penalties. Just as his moments of ecstasy are more poignant, so are the periods of depression of a man of genius more intense than those of other men . Every great man has such periods, of longer or shorter duration, times in which he loses self-confidence, … times in which, indeed, he may be sowing the seeds of a future harvest, but which are devoid of the stimulus to production."

“With ordinary men the moments which are united in a close continuity out of the original discrete multiplicity are very few, and the course of their lives resembles a little brook, whereas with the genius it is more like a mighty river into which all the little rivulets flow from afar; that is to say, the universal comprehension of genius vibrates to no experience in which all the individual moments have not been gathered up and stored.”

“The great genius does not let his work be determined by the concrete finite conditions that surround him, whilst it is from these that the work of the statesman takes its direction and its termination. … It is the genius in reality and not the other who is the creator of history, for it is only the genius who is outside and unconditioned by history.”

“Not only virtue, but also insight, not only sanctity but also wisdom, are the duties and tasks of mankind.”

“The great man of science, unless he is also a philosopher, … deserves the title of genius as little as the man of action.”

“A man is first reverent about himself, and self-respect is the first stage in reverence for all things.”

“Man must act in such a way that the whole of his individuality lies in each moment.”