Faith never makes a confession.

The study of geometry is a petty and idle exercise of the mind, if it is applied to no larger system than the starry one. Mathematics should be mixed not only with physics but with ethics; that is mixed mathematics.

The frontiers are not east or west, north or south; but wherever a man fronts a fact, though that fact be a neighbor, there is anunsettled wilderness between him and Canada, between him and the setting sun, or, farther still, between him and it. Let him build himself a log house with the bark on where he is, fronting IT, and wage there an Old French war for seven or seventy years, with Indians and Rangers, or whatever else may come between him and the reality, and save his scalp if he can.

I, who cannot stay in my chamber for a single day without acquiring some rust, and when sometimes I have stolen forth for a walk at the eleventh hour of four o'clock in the afternoon, too late to redeem the day, when the shades of night were already beginning to be mingled with the daylight, have felt as if I had committed some sin to be atoned for.

Some creatures are made to see in the dark.

What old people say you cannot do, you try and find that you can. Old deeds for old people, and new deeds for new.

Whatever has not come under the sway of man is wild. In this sense original and independent men are wild - not tamed and broken by society.