The discoverer and the poet are inventors; and they are so because their mental vision detects the unapparent, unsuspected facts, almost as vividly as ocular vision rests on the apparent and familiar.

Mathematicians do not write for the circulating library.

Imagination is not the exclusive appanage of artists, but belongs in varying degrees to all men.

The true function of philosophy is to educate us in the principles of reasoning and not to put an end to further reasoning by the introduction of fixed conclusions.

The discoverer and the poet are inventors; and they are so because their mental vision detects the unapparent, unsuspected facts, almost as vividly as ocular vision rests on the apparent and familiar.

Good writers are of necessity rare.

To one man a stream is so much water-power, to another a rendezvous for lovers.