"The mission of the Holy Ghost is to testify of the Father and the Son (see John 15:26 ; 2 Nephi 31:18 ; 3Nephi 28:11), to guide us into truth (see John 14:26 ; 16:13), and to show us all things we should do (see 2Nephi 32:5). This personal line of communication with our Heavenly Father through His Holy Spirit is the source of our testimony of truth, of our knowledge, and of our personal guidance from a loving Heavenly Father. It is an essential feature of His marvelous gospel plan, which allows each one of His children to receive a personal witness of its truth."
(Dallin H. Oaks, “Two Lines of Communication,” Ensign or Liahona, Nov. 2010, 83)
"When individuals … feel the Spirit working with them, or when they see the evidence of the Lord’s love and mercy in their lives, they are edified and strengthened spiritually and their faith in Him increases."
(M. Russell Ballard, “Now Is the Time,” Ensign, Nov. 2000, 75)