Those who have no hope for a future life are already dead for the present one.

Whatever is the lot of humankind I want to taste within my deepest self. I want to seize the highest and the lowest, to load its woe and bliss upon my breast, and thus expand my single self titanically and in the end go down with all the rest.

Nothing is more dangerous than solitude.

In all times it is only individuals that have advanced science, not the age.

The artist may be well advised to keep his work to himself till it is completed, because no one can readily help him or advise him with it... but the scientist is wiser not to withhold a single finding or a single conjecture from publicity.

Humor is one of the elements of genius--admirable as an adjunct; but as soon as it becomes dominant, only a surrogate for genius.

If you modestly enjoy your fame you are not unworthy to rank with the holy.