You can learn great things from your mistakes when you aren't busy denying them. Read The 7 Habits of Highly Effective People.
All that you achieve and all that you fail to achieve are the direct results of your thoughts.
Build your house on the rock of learning; no one can take your education away from you.
When values are clear, decisions are easy.
People are more what they hide than what they show.
Love is not about sex, going on fancy dates, or showing off. It's about being with a person who makes you happy in a way nobody else can.