"Anger is like gasoline. If you spray it around and somebody lights a match, you've got an inferno. [But] if we can put our anger inside an engine, it can drive us forward."

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Mangling my racket and an odd swearword on the court is not something I am proud of and it shouldn't happen, but even my coaches have told me that it's sometimes better to let it all out, the anger inside you, because keeping it bottled would just eat you up in the long term.

— Novak Djokovic