I believe that if people were taught these things throughout their school lives that our society would be a lot better off.
I will summarize the 13 points for you but please read the entire article from the link above.
1. Waste Time Feeling Sorry For Themselves
"They have learned to take responsibility for their actions and outcomes, and they have an inherent understanding of the fact that frequently life is not fair."
2. Give Away Their Power
"They understand they are in control of their actions and emotions. They know their strength is in their ability to manage the way they respond."
3. Shy Away From Change
"Their biggest "fear", if they have one, is not of the unknown, but of becoming complacent and stagnant."
4. Waste Energy on Things They Can't Control
"Mentally strong people don't complain (much) about bad traffic, lost luggage, or especially about other people, as they recognize that all of these factors are generally beyond their control.
5. Worry About Pleasing Others
"A mentally strong strives to be kind and fair and to please others where appropriate, but is unafraid to speak up."
6. Fear Taking Calculated Risks
"A mentally strong person is willing to take calculated risks."
7. Dwell on the Past
"...a mentally strong person is able to avoid miring their mental energy in past disappointments or in fantasies of the "glory days" gone by."
8. Make The Same Mistakes Over and Over
"Research shows that the ability to be self-reflective in an accurate and productive way is one of the greatest strengths of spectacularly successful executives and entrepreneurs."
9. Resent Other People's Success
"It takes strength of character to feel genuine joy and excitement for other people's success."
10. Give Up After Failure
"Every failure is a chance to improve."
11. Fear Alone Time
"...they don't depend on others to shore up their happiness and moods."
12. Feel The World Owes Them Anything
"...executives and employees at every level are gaining the realization that the world does not owe them a salary, a benefits package and a comfortable life, regardless of their preparation and schooling."
13. Expect Immediate Results
"They apply their energy and time in measured doses and they celebrate each milestone and increment of success along the way."