Author has written 20 stories for Card Captor Sakura, Dragon Ball Z, Hellsing, Final Fantasy VII, Junjō Romantica, Doctor Who, and Fate/stay night.
1) Being true to yourself and acting according to your principles shows your character better than speeches.
2) To be merciful when a punishment is due teaches a first offence individual better than simply punishing them out of hand because they have done something foolish; you have only to make them understand you could have been much, much worse than you were and it will give them pause to think before making that mistake again.
3) Be mindful of your actions; what you do will always have consequences for you and for others - be aware you will have to live with the consequences of your actions. With that in mind you will be armed with a short term view of your future.
4) Courage is not fearlessness; courage is the decision not to let fear govern your actions. A person without fear is either lying or not truly living any more in the sense that you and I are.
When you feel alone, look to your past. To the parents of your parents, and their parents before them. Each one had to face their fears - you are living proof that they overcame their fears by ensuring their children had the courage to go on when they were no longer there.