This is a very interesting idea. We literally rise to the occasion. We defeat the fear by realising we are bigger and stronger than we think we are. There is an idea that is very similar which talks about managing your impulse through not putting yourself in those positions. Successful people are not that different from regular people, they just decide either to not put themselves in a position where they may give in to their impulses, thus meaning that they build a stronger inner dialogue to say No. Or, on the contrary, they practice strengthening their impulsive inner voice and their response by actually facing these situations and saying No on purpose. Each person is different. Choose. Method and stick to it. But realise you are stronger than you think.