Henry George | Biography, Single Tax, & Progress and Poverty | Britannica

What is necessary to enable labor to produce these things, is land. When we speak of labor creating wealth, we speak metaphorically. Man creates nothing. The whole human race, were they to labor forever, could not create the tiniest mote that floats in a sunbeam—could not make this rolling sphere one atom heavier or one atom lighter. In producing wealth, labor, with the aid of natural forces, but works up, into the forms desired, pre-existing matter, and, to produce wealth, must, therefore, have access to this matter and to these forces—that is to say, to land. The land is the source of all wealth. It is the mine from which must be drawn the ore that labor fashions. It is the substance to which labor gives the form. And, hence, when labor cannot satisfy its wants, may we not with certainty infer that it can be from no other cause than that labor is denied access to land?

Henry George, Progress and Poverty, Book V, Chapter I, Page 272.

But if one man owned the island, and if we went there and you people were fools enough to allow me to lay claim to the ownership of the island and say it belonged to me, then I could charge a monopoly rent; I could make you pay me every penny that you earned, save just enough for you to live; and the reason I could not make you pay more is simply this, that if you would pay more you would die. … If we were to go to that island that we imagined, and if you were fools enough to admit that the land belonged to me, I would be your master, and you would be my slaves just as thoroughly, just as completely, as if I owned your bodies, for all I would have to do to send you out of existence would be to say to you get off my property. That is the cause of the industrial slavery that exists all over the world, that is the cause of the low wages, that is the cause of the unemployed labor.

Henry George, The Land for the People, Speech 1889