"Science rests on reason and experiment, and can meet an opponent with calmness; but a belief is always sensitive."

"The practical effect of a belief is the real test of its soundness."

"Human improvement is from within outward."

"You cannot dream yourself into a character; you must hammer and forge yourself one."

"The essence of greatness is neglect of the self."

"To deny the freedom of the will is to make morality impossible."

"Our human laws are more or less imperfect copies of the external laws as we see them."

"The better one is morally the less aware they are of their virtue."

"Instruction does not prevent waster of time or mistakes; and mistakes themselves are often the best teachers of all."

"Superior strength is found in the long run to lie with those who had right on their side."

"Age does not make us childish, as some say; it finds us true children."

"Philosophy goes no further than probabilities, and in every assertion keeps a doubt in reserve."

"The first duty of an historian is to be on guard against his own sympathies."

"In everyday things the law of sacrifice takes the form of positive duty."

"The superstition of science scoffs at the superstition of faith."

"The endurance of the inequalities of life by the poor is the marvel of human society."

"No person is ever good for much, that hasn't been swept off their feet by enthusiasm between ages twenty and thirty."

"Experience teaches slowly, and at the cost of mistakes."

"Fear is the parent of cruelty."