The child takes most of his nature of the mother, besides speech, manners, and inclination.

Mental power cannot be got from ill-fed brains.

Progress, therefore, is not an accident, but a necessity…It is a part of nature.

Those whose hardships are set forth in pamphlets and proclaimed in sermons and speeches which echo throughout society, are assumed to be all worthy souls, grievously wronged; and none of them are thought of as bearing the penalties of their misdeeds.

... those who have never entered upon scientific pursuits know not a tithe of the poetry by which they are surrounded... Sad, indeed, is it to see how men occupy themselves with trivialities, and are indifferent to the grandest phenomena - care not to understand the architecture of the heavens, but are deeply interested in some contemptible controversy about the intrigues of Mary Queen of Scots!

Reading is seeing by proxy.

The forces which are working out the great scheme of perfect happiness, taking no account of incidental suffering, exterminate such sections of mankind as stand in their way, with the same sternness that they exterminate beasts of prey and herds of useless ruminants.