Believing something can be done sets the mind in motion to find a way to do it.
Think you are weak, think you lack what it takes, think you will lose, think you are second class - think this way and you are doomed to mediocrity.
Attitudes are more important than intelligence.
Build castles, don't dig graves.
Then it dawned on me that no one else was going to believe in me until I believed in myself.
Those who believe they can move mountains, do. Those who believe they can't, cannot. Belief triggers the power to do.