"No real belief, however trifling and fragmentary it may seem, is ever truly insignificant; it prepares us to receive more of its like, confirms those which resembled it before, and weakens others; and so gradually it lays a stealthy train in our inmost thoughts, which may someday explode into overt action, and leave its stamp upon our character."
— William Kingdon Clifford
"The good life is one inspired by love and guided by knowledge. Neither love without knowledge nor knowledge without love can produce a good life. "
— Bertrand Russell
"It is impossible to learn that which one thinks one already knows."
"While life in its merely biological aspects is a miracle and a secret, man in his human aspects is an unfathomable secret to himself—and to his fellow man. We know ourselves, and yet even with all the efforts we may make, we do not know ourselves."
— Erich Fromm