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.
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 teacher.
-- Ben Johnson