Never underestimate the power of a kind word or deed. Become the most positive and enthusiastic person you know. Learn to listen. Think big thoughts, but relish small pleasures. Don't expect others to listen to your advice or ignore your example.
Opportunity sometimes knocks very softly.
Leave everything a little better than you found it. Never waste an opportunity to tell someone you love them. Treat everyone you meet like you want to be treated. Make new friends but cherish the old ones. Don't use time or words carelessly, neither can be retrieved.