Let no one be slow to seek wisdom when he is young, nor weary in search of it when he is grown old. For no age is too early or too late for the benefits of philosophy.
Epicurus; Letter to Menoeceus
The unexamined life is not worth living
Socrates; the Apology
Happy is the man that findeth wisdom, and the man that getteth understanding. For the merchandise of it is better than the merchandise of silver, and the gain thereof of fine gold.
She is more precious than rubies: and all the things thou canst desire are not to be compared unto her.
Proverbs 3: 13: 15
Everything should be made as simple as possible, but no simpler.