misattributed to Mark Twain: https://quoteinvestigator.com/2011/09/29/you-did/
You may not be her first, her last, or her only. She loved before she may love again. But if she loves you now, what else matters? She's not perfect — you aren't either, and the two of you may never be perfect together but if she can make you laugh, cause you to think twice, and admit to being human and making mistakes, hold onto her and give her the most you can. She may not be thinking about you every second of the day, but she will give you a part of her that she knows you can break — her heart. So don't hurt her, don't change her, don't analyze and don't expect more than she can give. Smile when she makes you happy, let her know when she makes you mad, and miss her when she's not there.
Recorded by journalist William Miller, printed on May 2, 1955 in “LIFE” magazine.
Ah! realise your youth while you have it. Don't squander the gold of your days, listening to the tedious, trying to improve the hopeless failure, or giving away your life to the ignorant, the common, and the vulgar. These are the sickly aims, the false ideals, of our age. Live! Live the wonderful life that is in you! Let nothing be lost upon you. Be always searching for new sensations. Be afraid of nothing....