Real knowledge is to know the extent of one's ignorance.
He who conquers others is strong; he who conquers himself is mighty.
An understanding of the natural world is a source of not only great curiosity, but great fulfilment.
Most of what matters in our lives takes place in our absence.
Tis very certain the desire of life prolongs it.
The cure for pain is in the pain.
Learn from the mistakes of others. You can never live long enough to make them all yourself.
Those who see the invisible can do the impossible.
Accuracy is the twin brother of honesty; inaccuracy, of dishonesty.
What a man does for others, not what they do for him, gives him immortality.
What's done can't be undone.
Only idiots refuse to change their minds.
In the midst of movement and chaos, keep stillness inside of you.
I think, therefore I am.
If we don't believe in freedom of expression for people we despise, we don't believe in it at all.
Take care of the pieces well. The whole will take care of itself.
Do not reveal what you have thought upon doing, but by wise council keep it secret being determined to carry it into execution.
Man is the only creature who refuses to be what he is.
How often it is that the angry man rages denial of what his inner self is telling him.
Good means not merely not to do wrong, but rather not to desire to do wrong.
Intellectuals solve problems, geniuses prevent them.