Nobody will laugh long who deals much with opium: its pleasures even are of a grave and solemn complexion.

Mathematics has not a foot to stand upon which is not purely metaphysical.

Grief even in a child hates the light and shrinks from human eyes.

In many walks of life, a conscience is a more expensive encumbrance than a wife or a carriage.

There is a necessity for a regulating discipline of exercise that, whilst evoking the human energies, will not suffer them to be wasted.

The peace of nature and of the innocent creatures of god seems to be secure and deep, only so long as the presence of man and his restless and unquiet spirit are not there to trouble its sanctity.

There is first the literature of knowledge, and secondly, the literature of power. The function of the first is--to teach; the function of the second is--to move, the first is a rudder, the second an oar or a sail. The first speaks to the mere discursive understanding; the second speaks ultimately, it may happen, to the higher understanding or reason, but always through affections of pleasure and sympathy.