To the sick, indeed, nature is sick, but to the well, a fountain of health.

Heal yourselves, doctors; by God I live.

The scenery, when it is truly seen, reacts on the life of the seer. How to live. How to get the most of life.... How to extract its honey from the flower of the world.

The youth gets together his materials to build a bridge to the moon, or, perchance, a palace or temple on the earth, and, at length, the middle-aged man concludes to build a woodshed with them.

Only he is successful in his business who makes that pursuit which affords him the highest pleasure sustain him.

We discover a new world every time we see the earth again after it has been covered for a season with snow.

My desire for knowledge is intermittent; but my desire to commune with the spirit of the universe, to be intoxicated with the fumes, call it, of that divine nectar, to bear my head through atmospheres and over heights unknown to my feet, is perennial and constant.