The word good has many meanings. For example, if a man were to shoot his grandmother at a range of five hundred yards, I should call him a good shot, but not necessarily a good man. – Gilbert K. Chesterton

No man is so foolish but he may sometimes give another good counsel, and no man so wise that he may not easily err if he takes no other counsel than his own. He that is taught only by himself has a fool for a master. – Hunter S. Thompson

Twice and thrice over, as they say, good is it to repeat and review what is good. – Plato