We must be young to do great things.

Basic characteristics of an individual organism: to divide, to unite, to merge into the universal, to abide in the particular, to transform itself, to define itself, and as living things tend to appear under a thousand conditions, to arise and vanish, to solidify and melt, to freeze and flow, to expand and contract. Since these effects occur together, any or all may occur at the same moment.

If you start to think of your physical and moral condition, you usually find that you are sick.

If you wish to advance into the infinite, explore the finite in all directions.

Commonplaceness, the surrender to the average, that good which is not bad but still the enemy of the best - That is our besetting danger.

Stupidity is without anxiety.

If there is confusion in your head and in your heart, what more do you want! A man who no longer loves and no longer errs should have himself buried straight away.