Adam Smith: Men vs. chessmen

The man of system . . . seems to imagine that he can arrange the different members of society with as much ease as the hand arranges the different pieces upon a chess-board; he does not consider that the pieces put upon the chess-board have no other principle of motion besides that which the hand impresses upon them; but that, in the great chess-board of human society, every single piece has a principle of motion of its own, altogether different from that which the legislature might choose to impress upon it.

—Adam Smith, The Theory of Moral Sentiments