Life rewards the dogged, not the qualified. - Bear Grylls

But, that guy who quit also missed the real point. Good things come through grit and hard work, and all things worthwhile have a cost. In the case of the SAS, the cost was somewhere around a thousand barrels of sweat.

The lesson is, the rewards in life don't always go to the biggest, or the bravest, or the smartest. The rewards go to the dogged; and when your going though hell, to the person who just keeps going.

That fine line between bravery and stupidity is endlessly debated – the difference really doesn’t matter.