To any and all, I have a question: What is the single best piece of advice you have ever been given? This could be anything (stock tip, parental wisdom, etc.), and may have been given to you by anyone--friend, spouse, parent, grandparent, child, etc. But what one piece of advice most strongly and positively affected you or your life? Thanks ahead of time for sharing. (You could share worst advice, too, if you prefer.)