Note: As the Church has said, the manual has been prepared as the primary source of lesson material. These supplements, from general conference addresses, are meant only as a complement to your study on this lesson’s topic.
Supplement is from President James E. Faust's talk "The Gift of the Holy Ghost--A Sure Compass" from the April 1989 General Conference:
The gift of the Holy Ghost comes after one repents and becomes worthy. It is received after baptism by the laying on of hands by those who have the authority. On the day of Pentecost, Peter instructed those who had previously been touched spiritually by the Holy Ghost, “Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.” (Acts 2:38.) Those possessing the gift of the Holy Ghost can come to a greater light and testimony. The Holy Ghost bears witness of the truth and impresses upon the soul the reality of God the Father and the son Jesus Christ so deeply that no earthly power or authority can separate him from that knowledge. (See 2 Ne. 31:18.)
The Book of Mormon, the Bible, and other scriptures, along with the guidance of modern prophets, provide true standards of conduct. In addition, the gift of the Holy Ghost is available as a sure guide, as the voice of conscience, and as a moral compass. This guiding compass is personal to each of us. It is unerring. It is unfailing. However, we must listen to it in order to steer clear of the shoals which will cause our lives to sink into unhappiness and self-doubt.