The world can only be grasped by action, not by contemplation. The hand is more important than the eye. We are active; and indeed we know, as something more than a symbolic accident in the evolution of man, that it is the hand that drives the subsequent evolution of the brain. We find tools today made by man before he became man. Benjamin Franklin in 1778 called man “a tool-making animal,” and that is right.

Jacob Bronowski (1908-1974) Polish-English humanist and mathematician

The Ascent of Man, ch. 3 (1973)