"Ideas excite me, and as soon as I get excited, the adrenaline gets going and the next thing I know I'm borrowing energy from the ideas themselves."

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It was the same with Schumacher: the need for the adrenaline rush, to push himself to the limit was always there. So without a Formula One car to race with he went on to do motorcycle racing and other stupid things, and obviously that wasn't enough to keep him happy, so he had a problem to sort out and returning to racing was his answer to the problem.

— Niki Lauda