Population, when unchecked, increases in a geometrical ratio.
The constant effort towards population, which is found even in the most vicious societies, increases the number of people before the means of subsistence are increased.
No limits whatever are placed to the productions of the earth; they may increase forever.
The ordeal of virtue is to resist all temptation to evil.
The power of population is indefinitely greater than the power in the earth to produce subsistence for man.
The histories of mankind are histories only of the higher classes.
