Choose well. Your choice is brief, and yet endless.

It is related of an Englishman that he hanged himself to avoid the daily task of dressing and undressing.

Hypotheses are the scaffolds which are erected in front of a building and removedd when the building is completed. They are indispensable to the worker; but the worker must not mistake the scaffolding for the building.

As soon as any one belongs to a narrow creed in science, every unprejudiced and true perception is gone.

As for solitude, I cannot understand how certain people seek to lay claim to intellectual stature, nobility of soul and strength of character, yet have not the slightest feeling for seclusion; for solitude, I maintain, when joined with a quiet contemplation of nature, a serene and conscious faith in creation and the Creator, and a few vexations from outside is the only school for a mind of lofty endowment.

Doubt grows with knowledge.

There is nothing in life so irrational, that good sense and chance may not set it to rights; nothing so rational, that folly and chance may not utterly confound it.