"Being human, they were scarcely more to be blamed for involuntarily regarding new ideas in their specialties with aversion than the weaver or the brickmaker for resisting the introduction of inventions calculated to take the bread out of his mouth. And yet consider what a tremendous, almost insurmountable, obstacle to human progress was presented by the fact that the intellectual leaders of the nations and the molders of the people's thoughts, by their economic dependence upon vested interests in established ideas, were biased against progress by the strongest motives of self-interest. When we give due thought to the significance of this fact, we shall find ourselves wondering no longer at the slow rate of human advance in the past, but rather that there should have been any advance at al
