"I am forced to say that I have many fiercer critics than myself"

This quote by Irwin Shaw speaks to the concept of self-criticism. He is acknowledging that he is his own harshest critic, but that there are others who are much more important of him. This could be interpreted as an indication of humbleness, as he is acknowledging that there are people who are more knowledgeable and knowledgeable than him, which they may have a much better understanding of his work. It could also be translated as an indication of resilience, as he is acknowledging that he has critics, however is not letting them bring him down. He is accepting that criticism is part of life, and is using it to become a better individual. Eventually, this quote talks to the idea that criticism can be used as a tool for development, which it must not be feared.