Those that are firm in their will mold the world to themselves.

It is always a sign of an unproductive time when it concerns itself with petty and technical aspects [in philology], and likewiseit is a sign of an unproductive person to pursue such trifles.

The passions are like those demons with which Afrasahiab sailed down the Orus. Our only safety consists in keeping them asleep. If they we are lost.

There are people who make no mistakes because they never wish to do anything worth doing.

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.

Theories are usually the over-hasty efforts of an impatient understanding that would gladly be rid of phenomena, and so puts in their place pictures, notions, nay, often mere words.

We must be young to do great things.