Candidates for sainthood have to go through a rigorous process which involves a thorough inspection of all their actions and writings. They also have to provide intercession for two miracles. The process is fascinating. Please listen to the whole episode to learn more.
What is Canonization?
Canonization is simply the process of recognizing people who have lived heroically virtuous lives, and elevating them so that Catholics all over the world may freely celebrate and honor them.