Who said “To be wholly devoted to some intellectual exercise is to have succeeded in life.”?

“Nothing mattered except states of mind, chiefly our own.”

“Intellectual brilliance is no guarantee against being dead wrong.”

“It is not clear that intelligence has any long-term survival value.”

“The good are so harsh to the clever, the clever so rude to the good!”

“Man is an intelligence, not served by, but in servitude to his organs.”

“No man is useless while he has a friend.”

“There is no duty we so much underrated as the duty of being happy.”

“For God's sake give me the young man who has brains enough to make a fool of himself!”

“Our business in this world is not to succeed, but to continue to fail, in good spirits.”

“The world is so full of a number of things, I'm sure we should all be as happy as kings.”

“To be what we are, and to become what we are capable of becoming, is the only end of life.”