Youth

Cherish Youth, do what you want. Don't regret when you become old ... --zQ

From 30 years old, you would realize that your body starts to be on the decline --Adpated from a Radio DJ

Life

Most important principle in life: Never regret wasting any part of your only life --zQ

Happiness

The grand essentials 2 happiness in this life r something 2 do, something 2 love, & something to hope for. -- Joseph Addison