"[T]he only species on earth which prides itself on its intelligence is the only one with the intelligence necessary, …"

"Man becomes man only by the intelligence, but he is man only by the heart."

"You don't realize that you're intelligent until it gets you into trouble."

"Comprehension, inventiveness, direction, and criticism: intelligence is contained in these four words."

"Some recent philosophers seem to have given their moral approval to these deplorable verdicts that affirm that the in…"

"An intelligent man neither allows himself to be controlled nor attempts to control others; he wishes reason alone to …"

"She should be my counsellor, But not my tyrant. For the spirit needs Impulses from a deeper source than hers; And the…"

"There are maybe two or three thousand people in the world as smart as us, little sister. Most of them are making a li…"

"Clever men often have intellectual blind spots. And extremely clever men—perhaps those who are the cleverest of all—h…"

"The surest way to be deceived is to think oneself more clever than others."