Authors:

If your friend is critical [of your work], you have to have a very thick skin and a thick skin is something that only builds up after it's callused for awhile.

"Damon Lindelof on Struggling With Depression and Why Knowing J.J. Abrams is 'A Bit of a Curse'". Interview with Stephen Galloway, www.hollywoodreporter.com. November 8, 2015.
If your friend is critical [of your work], you have to have a very thick skin and a thick skin is something that only builds up after it's callused for awhile.