Knowledge is true opinion. — Plato

In friendship as well as love, ignorance very often contributes more to our happiness than knowledge. — Francois de La Rochefoucauld
Only on paper has humanity yet achieved glory, beauty, truth, knowledge, virtue, and abiding love. — George Bernard Shaw
The man of knowledge must be able not only to love his enemies but also to hate his friends. — Friedrich Nietzsche
And what, Socrates, is the food of the soul? Surely, I said, knowledge is the food of the soul. — Plato
Know one knows whether death, which people fear to be the greatest evil, may not be the greatest good. — Plato
The eyes of the soul of the multitudes are unable to endure the vision of the divine. — Plato