George Albert Smith said this quote

“ 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. ”