"There are two influences ever present in the world. One is constructive and elevating and comes from our Heavenly Father; the other is destructive and debasing and comes from Lucifer. We have our agency and make our own choice in life subject to these unseen powers. There is a division line well defined that separates the Lord's territory from Lucifer's. If we live on the Lord's side of the line Lucifer cannot come there to influence us, but if we cross the line into his territory we are in his power. By keeping the commandments of the Lord we are safe on His side of the line, but if we disobey His teachings we voluntarily cross into the zone of temptation and invite the destruction that is ever present there. Knowing this, how anxious we should always be to live on the Lord's side of the line." (emphasis added)
George Albert Smith, Improvement Era, May 1935, p. 278
"For behold, the Spirit of Christ is given to every man, that he may know good from evil; wherefore, I show unto you the way to judge; for every thing which inviteth to do good, and to persuade to believe in Christ, is sent forth by the power and gift of Christ; wherefore ye may know with a perfect knowledge it is of God. But whatsoever thing persuadeth men to do evil, and believe not in Christ, and deny him, and serve not God, then ye may know with a perfect knowledge it is of the devil; for after this manner doth the devil work, for he persuadeth no man to do good, no, not one; neither do his angels; neither do they who subject themselves unto him."