It often happens that a man develops a deeper love and friendship with his pet cat or dog than he does with most of the other humans in his life.

To him whose elastic and vigorous thought keeps pace with the sun, the day is a perpetual morning. It matters not what the clocks say or the attitudes and labors of men. Morning is when I am awake and there is a dawn in me.

We need to witness our own limits transgressed, and some life pasturing freely where we never wander.

The next time the novelist rings the bell I will not stir though the meeting-house burn down.

Alas! how little does the memory of these human inhabitants enhance the beauty of the landscape!

Mathematics should be mixed not only with physics but with ethics.

My excuse for not lecturing against the use of tobacco is, that I never chewed it; that is a penalty which reformed tobacco-chewers have to pay; though there are things enough I have chewed which I could lecture against.