Sunshine cannot bleach the snow, Nor time unmake what poets know.
Of all the sciences needful for men, the chief one is the knowledge of how to live, doing as little harm as possible; and of all arts, the most important is that which teaches how to avoid evil, and how to produce good with the least violence.
Most teachers waste their time by asking questions which are intended to discover what a pupil does not know, whereas the true art of questioning has for its purpose to discover what the pupil knows or is capable of knowing.
He knows the universe, and himself he does not know.
Ignorance is better than an affected knowledge.
What can I know? What ought I to do? What can I hope?
The main scourge of humanity is not ignorance, because the ignorant often have excuses, but the refusal to know.
Without knowing what I am and why I am here, life is impossible.
