A great emigration necessarily implies unhappiness of some kind or other in the
country that is deserted.
A writer may tell me that he thinks man will ultimately become an ostrich. I cannot properly contradict him.
Each pursues his own theory, little solicitous to correct or improve it by an attention to what is advanced by his opponents.
I do not know that any writer has supposed that on this earth man will ultimately be able to live without food.
I think it will be found that experience, the true source and foundation of all knowledge, invariably confirms its truth.
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.
It is an acknowledged truth in philosophy that a just theory will always be confirmed by experiment.
No limits whatever are placed to the productions of the earth; they may increase forever.
Population, when unchecked, goes on doubling itself every 25 years or increases in a geometrical ratio.
Population, when unchecked, increases in a geometrical ratio.
The histories of mankind are histories only of the higher classes.
The main peculiarity which distinguishes man from other animals is the means of his support-the power which he possesses of very greatly increasing these means.
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.