In the first chapter of How Steel Was Tempered, the priest played a very important role. His name was Nikolay Kastrovsky, and he was a Russian priest who believed in the Roman religion. Nikolay Kastrovsky was a very talented priest who had a strong interest in science and medicine and was committed to applying this knowledge to his religious practice. Through his own research and experiments, he discovered some secrets about steel manufacturing and told this knowledge to Paul Kochagin. When Paul was worrying about how to explain to his mother, Nikola Kastrovsky appeared and gave Paul some useful advice to help him better explain his situation and growth experience to his mother. This scene showed the kindness and enthusiasm of Nikola Kastrovsky as a priest, as well as his concern and contribution to the progress and growth of mankind.