Elder Robert D. Hales of the Quorum of the Twelve Apostles observed that having the Holy Ghost influences our conduct and solidifies our testimonies:
“The Holy Ghost gives us the strength and courage to conduct our lives in the ways of the kingdom of God and is the source of our testimony of the Father and the Son. …
“By choosing to be in His kingdom, we separate—not isolate—ourselves from the world. Our dress will be modest, our thoughts pure, our language clean. The movies and television we watch, the music we listen to, the books, magazines, and newspapers we read will be uplifting. We will choose friends who encourage our eternal goals, and we will treat others with kindness. We will shun the vices of immorality, gambling, tobacco, liquor, and illicit drugs. Our Sunday activities will reflect the commandment of God to remember the Sabbath day and keep it holy. We will follow the example of Jesus Christ in the way we treat others. We will live to be worthy to enter the house of the Lord” (in Conference Report, Oct. 2000, 6–7; or Ensign, Nov. 2000, 8).