Does the thoughtful man suppose that...the present experiment in civilization is the last world we will see?

A simple life is its own reward.

The scientific value of truth is not, however, ultimate or absolute. It rests partly on practical, partly on aesthetic interests. As our ideas are gradually brought into conformity with the facts by the painful process of selection,-for intuition runs equally into truth and into error, and can settle nothing if not controlled by experience,-we gain vastly in our command over our environment. This is the fundamental value of natural science

The fly that prefers sweetness to a long life may drown in honey.

Fanaticism consists of redoubling your effort when you have forgotten your aim.

Oaths are the fossils of piety.

Almost every wise saying has an opposite one, no less wise, to balance it.