Learn all your life. Learn from your failures. Learn from your successes, When you hit a spell of trouble, ask “What is it trying to teach me?” The lessons aren’t always happy ones, but they keep coming. It isn’t a bad idea to pause occasionally for an inward look. By midlife, most of us are accomplished fugitives from ourselves.
Ref: In 1964 John W. Gardner published Self-Renewal: The Individual and the Innovative Society.