If I Only Knew Then...

I think this year has been my year of self discovery.  I've read more books from January through now than I've read in the past ten years and each of them has been picked up with a goal of exploring an area of life that I've paid little attention to before.  It has been a great and challenging year so far and I've found myself mumble the saying "oh, if I only knew then what I know now...", perhaps this is a saying that you've also used or heard in the past?

My questions to you are -

1. If you were going to give your life's advice to a young person today, what lesson would you tell them that you've learned?  
2. What pebble of wisdom do you wish you would have found earlier in life?