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In the performing arts you have to have thick, thick, thick skin, because of all the rejection you face on a daily basis, and the fact that work never lasts for very long. But you need thin, thin, thin skin in order to access all of your emotions and your creativity so that you can express it. You can't be dead inside. Otherwise you've got nothing to give. So it's a paradox, that we have to exist in both planes in order to do what we do.

Source: www.achievement.org
In the performing arts you have to have thick, thick, thick skin, because of all the rejection you face on a daily basis, and the fact that work never lasts for very long. But you need thin, thin, thin skin in order to