Mormon was exposed to the horrors of Satan's power all his life, yet was spiritually able to withstand its effects and maintain his faith in God. He must have had an incredible spirit.
"Next, as we confront our own lesser trials and tribulations, we too can plead with the Father, just as Jesus did, that we "might not … shrink" – meaning to retreat or to recoil (D&C 19:18). Not shrinking is much more important than surviving! Moreover, partaking of a bitter cup without becoming bitter is likewise part of the emulation of Jesus." (Elder Maxwell)