If you think you can do it, you can.
To be a good loser is to learn how to win.
Know or listen to those who know.
Things do not happen. Things are made to happen.
To know oneself, one should assert oneself.
If you're going through hell, keep going.
Expect problems and eat them for breakfast.
The most effective way to do it, is to do it.
Only the educated are free.
Well done is better than well said.
And, in fact, you can find that the lack of basic resources, material resources, contributes to unhappiness, but the increase in material resources do not increase happiness.