I am too easily contented with a slight and almost animal happiness. My happiness is a good deal like that of the woodchucks.

If we knew all the laws of Nature, we should need only fact, or the description of one actual phenomenon, to infer all the particular results at that point.

Nature spontaneously keeps us well. Do not resist her!

Faith keeps many doubts in her pay. If I could not doubt, I should not believe.

How important is a constant intercourse with nature and the contemplation of natural phenomena to the preservation of moral and intellectual health!

It is remarkable that, notwithstanding the universal favor with which the New Testament is outwardly received, and even the bigotry with which it is defended, there is no hospitality shown to, there is no appreciation of, the order of truth with which it deals. I know of no book that has so few readers. There is none so truly strange, and heretical, and unpopular. To Christians, no less than Greeks and Jews, it is foolishness and a stumbling-block.

Nature has from the first expanded the minute blossoms of the forest only toward the heavens, above men's heads and unobserved bythem. We see only the flowers that are under our feet in the meadows.