From the book 1776 (which is quite good, by the way):
“He was not a brilliant strategist or tactician, not a gifted orator, not an intellectual. At several crucial moments he had shown marked indecisiveness. He had made serious mistakes in judgment. But experience had been his great teacher from boyhood, and in this his greatest test, he learned steadily from experience. Above all, Washington never forgot what was at stake and he never gave up.”Clearly, there’s a lot to be said for never giving up.