President Monson quote

. . . The Lord indicated that we should let virtue garnish our thoughts unceasingly^.

I recall a priesthood meeting held in the Tabernacle in Salt Lake City when I was a holder of the Aaronic Priesthood. The President of the Church was speaking to the priesthood, and he made a statement I have never forgotten. He said, in essence, that men who commit sexual sin or other sins do not do so in the twinkling of an eye. He emphasized that our actions are preceded by our thoughts, and when we commit sin, it is because we have first thought of committing that particular sin. Then the President declared that the way to avoid sin is to keep our thinking pure. The scripture tells us that as we think in our hearts, so are we. We must have the mark of virtue.

If we are to be missionaries in the kingdom of our Heavenly Father, we must be entitled to the companionship of His Holy Spirit, and we have been told precisely that His Spirit will not dwell in impure or unholy tabernacles.

"A Royal Priesthood" Thomas S. Monson General Conference October 2007