Reading is learning, but applying is also learning and the more important kind of learning at that. Our chief method is to learn warfare through warfare. A person who has had no opportunity to go to school can also learn warfare - he can learn through fighting in war. A revolutionary war is a mass undertaking; it is often not a matter of first learning and then doing, but of doing and then learning, for doing is itself learning.

Mao Tse-tung on War (ed. 1966)