“We came here to be tested and proved by coming in contact with evil as well as the good. … The Father has permitted Satan and his hosts to tempt us, but by the guidance of the Spirit of the Lord and the commandments given through revelation, we are prepared to make our choice. If we do evil, we have been promised that we will be punished; if we do good, we will receive the eternal reward of righteousness.This mortal probation [is] a brief period, just a short span linking the eternity past with the eternity future. Yet it [is] a period of tremendous importance. … This life is the most vital period in our eternal existence” (Teachings of Presidents of the Church: Joseph Fielding Smith, p. 66-67).