" Here was compelling cause-and-effect evidence that the will to win and the will to prepare are one and the same.
The real test comes on those mornings when you wake up after a late night out and the very last thing you want to do is get up and train, knowing you’re going to work furiously hard and you’re going to sweat buckets. There might be a moment’s debate in your mind.
“Should I skip it today, just this once?” But you don’t listen to your mind’s siren songs because you know that they will lead you down a dangerously steep and slippery slope. If you flag once, you’ll flag again. "

― Rafael Nadal , Rafa