When thou art converted, strengthen thy brethren.

I still remember when I first heard this counsel the title of a Melchizedek Priesthood lesson manual. When put together in context that Christ said this to Peter right after telling Peter that he had prayed to guard Peter against the efforts of Satan I conclude that he was counseling Peter to use the power of faith that he would develop in the service of guarding his fellow laborers against the advanced of the enemy of their souls.