No limits whatever are placed to the productions of the earth; they may increase forever.

The power of population is indefinitely greater than the power in the earth to produce subsistence for man.

A writer may tell me that he thinks man will ultimately become an ostrich. I cannot properly contradict him.

In a state therefore of great equality and virtue, where pure and simple manners prevailed, the increase of the human species would evidently be much greater than any increase that has been hitherto known.

How inappropriate to call this planet earth when it is quite clearly Ocean.

Whatever talents I possess may suddenly diminish or suddenly increase. I can with ease become an ordinary fool. I may be one now. But it doesn't do to upset one's own vanity.