Judgement can do without knowledge: but not knowledge withou... - Michel de Montaigne, The Complete Essays

"There is nothing more notable in Socrates than that he found time, when he was an old man, to learn music and dancing, and thought it time well spent."

"I quote others only in order the better to express myself."

"It is a disaster that wisdom forbids you to be satisfied with yourself and always sends you away dissatisfied and fearful, whereas stubbornness and foolhardiness fill their hosts with joy and assurance."

"Learned we may be with another man's learning: we can only be wise with wisdom of our own."

"Every other knowledge is harmful to him who does not have knowledge of goodness."