A collection of diverse quotes on wisdom and the like from other philosophers. Plucked haphazardly from wikiquote.
Plato:
"And all knowledge, when separated from justice and virtue, is seen to be cunning and not wisdom; wherefore make this your first and last and constant and all-absorbing aim, to exceed, if possible, not only us but all your ancestors in virtue; and know that to excel you in virtue only brings us shame, but that to be excelled by you is a source of happiness to us."
"I only wish that wisdom were the kind of thing that flowed … from the vessel that was full to the one that was empty."
Aristotle:
"The wise man must not be ordered but must order, and he must not obey another, but the less wise must obey him."
"The truly good and wise man will bear all kinds of fortune in a seemly way, and will always act in the noblest manner that the circumstances allow."
Aristippus, the Cyrenaic:
On one occasion he was asked in what respect a wise man is superior to one who is not wise; and his answer was:
"Send them both naked among strangers, and you will find out."
Diogenes, the Cynic:
"Everything belongs to the gods; the wise are friends of the gods; friends hold all things in common; ergo, everything belongs to the wise."
"The noblest people are those despising wealth, learning, pleasure and life; esteeming above them poverty, ignorance, hardship and death."
Zeno, the Stoic:
"If melodiously piping flutes sprang from the olive, would you doubt that a knowledge of flute-playing resided in the olive? And what if plane trees bore harps which gave forth rhythmical sounds? Clearly you would think in the same way that the art of music was possessed by plane trees. Why, then, seeing that the universe gives birth to beings that are animate and wise, should it not be considered animate and wise itself?"
"No one entrusts a secret to a drunken man; but one will entrust a secret to a good man; therefore, the good man will not get drunk."