Mental toughness is a state of mind - you could call it 'character in action.'
It does not matter how many times you get knocked down, but how many times you get up.
If you can accept losing, you can't win.
The true measure of a man is how he treats someone who can do him absolutely no good. Ann Landers It's not whether you get knocked down; it's whether you get back up.
Inches make champions.
There is only one kind of discipline, and that is the perfect discipline. As a leader, you must enforce and maintain that discipline; otherwise, you will fail at your job.