Books minister to our knowledge, to our guidance, and to our delight, by their truth, their uprightness, and their art.

Insincerity is always weakness; sincerity even in error is strength.

The magic of the pen lies in the concentration of your thoughts upon one object.

Originality is independence, not rebellion; it is sincerity, not antagonism.

Mathematicians do not write for the circulating library.

A man may be buoyed up by the efflation of his wild desires to brave any imaginable peril; but he cannot calmly see one he loves braving the same peril; simply because he cannot feel within turn that which prompts another. He sees the danger, and feels not the power that is to overcome it.

We must never assume that which is incapable of proof.