Who said “Cleverness is serviceable for everything, sufficient for nothing.”?

“Clever men are good, but they are not the best.”

“Cleverness is not wisdom.”

“The desire to seem clever often keeps us from being so.”

“A cul-de-sac to which ideas are lured and then quietly strangled.”

“Mother is far too clever to understand anything she does not like.”

“Uncertainty is the refuge of hope.”

“Will localizes us; thought universalizes us.”

“Our duty is to be useful, not according to our desires, but according to our powers.”

“An error is the more dangerous in proportion to the degree of truth which it contains.”

“To do easily what is difficult for others is the mark of talent. To do what is impossible for talent is the mark of genius.”

“Without passion man is a mere latent force and possibility, like the flint which awaits the shock of the iron before it can give forth its spark.”