Even as you grow wiser and wiser with age you must remind yourself that an understanding is never absolutely final.  What’s currently right could easily be wrong later.  Thus, the most destructive illusion is a settled point of view.  So remember that success in life does not depend on always being right.  To make real progress you must let go of the assumption that you already have all the answers.  You can listen to others, learn from them, and successfully work with them even though you may not agree with every opinion they have.  When people respectfully agree to disagree, everyone benefits from the diversity of perspective.