Our enlightened posterity will look back upon us who eat oxen and sheep, just as we look upon cannibals.

To cultivate the intellect is therefore a religious duty; and when this truth is fairly recognized by men, the religion which teaches that the intellect should be distrusted and that it should be subservient to faith, will inevitably fall.

One fact must be familiar to all those who have any experience of human nature - a sincerely religious man is often an exceedingly bad man.

And then, the Earth being small, mankind will migrate into space, and will cross the airless Saharas which separate planet from planet and sun from sun. The Earth will become a Holy Land which will be visited by pilgrims from all the quarters of the Universe. Finally, men will master the forces of Nature; they will become themselves architects of systems, manufacturers of worlds.

Our enlightened posterity will look back upon us who eat oxen and sheep, just as we look upon cannibals.

Doubt is the offspring of knowledge: the savage never doubts at all.

There is a certain class of people who prefer to say that their fathers came down in the world through their own follies than to boast that they rose in the world through their own industry and talents. It is the same shabby-genteel sentiment, the same vanity of birth which makes men prefer to believe that they are degenerated angels rather than elevated apes.