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" The great and unlooked for discoveries that have taken place of late years have all concurred to lead many men into the opinion that we were touching on a period big with the most important changes. "

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

" The friend of the present order of things condemns all political speculations in the gross. "

" 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. "

" Each pursues his own theory, little solicitous to correct or improve it by an attention to what is advanced by his opponents. "

" It is an acknowledged truth in philosophy that a just theory will always be confirmed by experiment. "

" 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. "

" I think it will be found that experience, the true source and foundation of all knowledge, invariably confirms its truth. "

" Population, when unchecked, increases in a geometrical ratio. "

" 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. "

" The superior power of population cannot be checked without producing misery or vice. "

" I do not know that any writer has supposed that on this earth man will ultimately be able to live without food. "

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

" Population, when unchecked, goes on doubling itself every 25 years or increases in a geometrical ratio. "

" The ordeal of virtue is to resist all temptation to evil. "

" The histories of mankind are histories only of the higher classes. "

" A great emigration necessarily implies unhappiness of some kind or other in the country that is deserted. "