Land, as before said, is the free gift of the Creator in common to the human race. Personal property is the effect of Society; and it is as impossible for an individual to acquire personal property without the aid of Society, as it is for him to make land originally. Separate an individual from society, and give him an island or a continent to possess, and he cannot acquire personal property. He cannot become rich. So inseparably are the means connected with the end, in all cases, that where the former do not exist, the latter cannot be obtained. All accumulation therefore of personal property, beyond what a man’s own hands produce, is derived to him by living in society; and he owes, on every principle of justice, of gratitude, and of civilization, a part of that accumulation back again to society from whence the whole came.

Thomas Paine, Agrarian Justice, 1797

I am among those who think well of the human character generally, I consider man as formed for society, and endowed by nature with those dispositions which fit him for society. I believe also, with Condorcet, as mentioned in your letter, that his mind is perfectible to a degree of which we cannot as yet form any conception. It is impossible for a man who takes a survey of what is already known, not to see what an immensity in every branch of science yet remains to be discovered, & that too of articles to which our faculties seem adequate.

Thomas Jefferson, letter to William Munford, June 18, 1799