Look for the best in everybody
The person who failed often knows how to avoid future failures. The person who knows only success can be more oblivious to all the pitfalls.
No matter how bad things are, you can always make things worse.
Complaining does not work as a strategy.
When you're frustrated with people, when they've made you angry, it just may be because you haven't given them enough time.
Showing gratitude is one of the simplest yet most powerful things humans can do for each other.