"This is my wish for you: Comfort on difficult days, smiles when sadness intrudes, rainbows to follow the clouds, laughter to kiss your lips, sunsets to warm your heart, hugs when spirits sag, beauty for your eyes to see, friendships to brighten your being, faith so that you can believe, confidence for when you doubt, courage to know yourself, patience to accept the truth, Love to complete your life." - Ralph Waldo Emerson
What Emerson is trying to say is that you should be detained by the mistakes in your past. Do not let your regrets hold you back from going into a brighter future. What is done is done and you just need to learn from it and move on.
Things Mentally Strong People Don’t Do: They don't waste time feeling sorry for themselves. Give a way their power. Shy away from change. Waste energy on things they can't control. Worry about Pleasing everyone. Fear taking calculate risks. Fear alone time. Dwell on the past. Make same mistakes over and over. Resent other people's successor. Give up after the first failure. Feel the world owes them anything. Expect immediate Results.