Courage is not simply one of the virtues, but the form of every virtue at the testing point. C. S. Lewis
As soon as you concern yourself with the 'good' and 'bad' of your fellows, you create an opening in your heart for maliciousness to enter. Testing, competing with, and criticizing others weaken and defeat you. Morihei Ueshiba
Boxing is the ultimate challenge. There's nothing that can compare to testing yourself the way you do every time you step in the ring. Sugar Ray Leonard
Now I see that going out into the testing ground of men it is the tongue and not the deed that wins the day. Sophocles
Testing oneself is best when done alone. Jimmy Carter