Wild liberty develops iron conscience. Want of liberty, by strengthening law and decorum, stupefies conscience.

Duty grows everywhere--like children, like grass.

The purpose of life seems to be to acquaint a man with himself and whatever science or art or course of action he engages in reacts upon and illuminates the recesses of his own mind. Thus friends seem to be only mirrors to draw out and explain to us ourselves; and that which draws us nearer our fellow man, is, that the deep Heart in one, answers the deep Heart in another, - that we find we have (a common Nature) - one life which runs through all individuals, and which is indeed Divine.

That man is idle who can do something better.

Invention breeds invention.

Life is a perpetual instruction in cause and effect.

An eye can threaten like a loaded and levelled gun, or it can insult like hissing or kicking; or, in its altered mood, by beams of kindness, it can make the heart dance for joy. ... One of the most wonderful things in nature is a glance of the eye; it transcends speech; it is the bodily symbol of identity.