Don’t practice until you can’t get it right, practice until you can’t get it wrong

I recorded this in one take, which is ironic. 

Nick Saban says "Don't practice until you can't get it right, practice until you can't get it wrong."

And it's often said that you don't rise to the occasion, you fall to the level of your training.

So if you practice to a point you can't get it wrong, what happens when the occasion happens? And what do you get out of it?