It seems safe to look forward to the time when the conception of attractive and repulsive forces, having served its purpose as a useful piece of scientific scaffolding, will be replaced by the deduction of the phenomena known as attraction and repulsion, from the general laws of motion.

My experience of the world is that things left to themselves don't get right.

It is because the body is a machine that education is possible. Education is the formation of habits, a superinducing of an artificial organization upon the natural organization of the body.

If a little knowledge is dangerous, where is the man who has so much as to be out of danger?

That mysterious independent variable of political calculation, Public Opinion.

The man of science has learned to believe in justification, not by faith, but by verification.

A good man: body serves his will and enjoys hard work, clear intellect that understands the truths of nature, full of passion for life but controlled by his will, well-developed conscience, loves beauty in art and nature, despises inferior morality, respects himself and others.