Science rests on reason and experiment, and can meet an opponent with calmness; [but] a creed is always sensitive.
Human improvement is from within outward.
To deny the freedom of the will is to make morality impossible.
The moral system of the universe is like a document written in alternate ciphers, which change from line to line.
The essence of greatness is neglect of the self.
The practical effect of a belief is the real test of its soundness. Where we find a heroic life appearing as the uniform fruit of a particular mode of opinion, it is childish to argue in the face of fact that the result ought to have been different.