Question: Why is the Holy Ghost necessary to gain a testimony of Jesus Christ?
Answer: “...The Holy Ghost is also a testifier. This Holy Spirit can help you really understand deep down inside the most important truth ever known—that Jesus Christ is the Savior of the world and that because of Him, every one of us who ever lived will one day live again.” (April 2001, “A Comforter, a Guide, a Testifier,” by Margaret D. Nadauld, Young Women General President)
“A testimony is a spiritual witness given by the Holy Ghost. The foundation of a testimony is the knowledge that Heavenly Father lives and loves us; that Jesus Christ lives, that He is the Son of God, and that He carried out the infinite Atonement; that Joseph Smith is the prophet of God who was called to restore the gospel; that we are led by a living prophet today; and that The Church of Jesus Christ of Latter-day Saints is the Savior’s true Church on the earth. With this foundation, a testimony grows to include all principles of the gospel.” (Student Manual, “True to the Faith”)
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1 Corinthians 12:3
3 Wherefore I give you to understand, that no man speaking by the Spirit of God calleth Jesus accursed (no person who has the Holy Ghost opposes Jesus): and that no man can say (know) that Jesus is the Lord, but by the Holy Ghost (you cannot have a firm testimony of the Savior unless it is given you by the Holy Ghost).
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Elder Robert D. Hales, Of the Quorum of the Twelve Apostles:
My brothers and sisters, over the past few months I have had a humbling experience which has given me the opportunity to reflect with gratitude on the gift of life. In the course of this experience, I have continually pondered my testimony of God our Eternal Father and His eldest Son, our Savior and Redeemer, Jesus Christ, and how I gained my testimony of the Father and the Son.
People all over the world, of every creed and persuasion, search and struggle to know, Who is God? What is His relationship to Jesus Christ? And what is our relationship with Them?
I know with surety that our Heavenly Father and Jesus Christ live. The Atonement is real. God the Father and Jesus Christ are distinct, separate, immortal beings. They know us as individuals, and They hear and answer our sincere prayers. The Savior testified to the inhabitants of the New World, “I bear record of the Father, and the Father beareth record of me, and the Holy Ghost beareth record of the Father and me.” The Holy Ghost has testified to me that these things are true.
I began to gain my testimony in my youth when I reflected on 13 prophetic statements called the Articles of Faith, written by Joseph Smith. It was in Primary that we memorized them. They describe the basic beliefs of the restored gospel of Jesus Christ. The first of these statements reads, “We believe in God, the Eternal Father, and in His Son, Jesus Christ, and in the Holy Ghost.”
Joseph Smith knew the nature of the three members of the Godhead by personal experience. As a 14-year-old boy he wanted to know which of the many Christian churches he should join. In the Bible, in the book of James of the New Testament, he read, “If any of you lack wisdom, let him ask of God.” Obediently he knelt in prayer and was visited by God the Father and His Son, Jesus Christ. He described Them as “two Personages, whose brightness and glory defy all description, standing above [Joseph] in the air. One of them [God the Father] spake unto [him], calling [him] by name and said, pointing to the other—This is My Beloved Son. Hear Him!”
Since my own boyhood, Joseph Smith’s experience has been a guide to me—and can be for all of us. The young prophet learned the truth about our Heavenly Father and His Son, Jesus Christ, because he sought to know from the scriptures his Heavenly Father’s will and then he faithfully obeyed...
It is very enlightening and touching to me to consider how Jesus talks to His Father. In His great Intercessory Prayer, which is found in the Bible in the book of John, it is unmistakably clear that Jesus acknowledges He is the Son...
Jesus showed His great love for those who choose to follow Him as He prayed for their protection: “I pray not that thou shouldest take them out of the world, but that thou shouldest keep them from the evil.” He was praying for us, brothers and sisters.
And then our Savior tenderly asks that they, meaning us, may be with Him again: “Father, I will that they also, whom thou hast given me, be with me where I am.”...
I testify that our Savior lives. He is the Only Begotten of the Father, and He will come again on this earth to reign. He is Jesus Christ, the Holy One of Israel, “full of grace, and mercy, and truth. It is he that cometh to take away the sins of the world, yea, the sins of every man who steadfastly believeth on his name.” He is the literal Son of God, who rose from the dead on the third day, bringing the reality of resurrection to all who will come to earth. I also testify that God our Eternal Father lives and loves each of us, for we are His children. So great is His love that He sent His Only Begotten Son into the world “that whosoever believeth in him should not perish, but have everlasting life.”
As an Apostle of the Lord Jesus Christ, I testify of the truth of what is in the scriptures and what has been told to me and can be told to you by the Holy Spirit. It will be revealed according to your obedience and desires. The Savior taught us during His mortal ministry this great truth that applies to all of us: “Whatsoever ye shall ask the Father in my name, which is right, believing that ye shall receive, behold it shall be given unto you.” I testify that I do know these things, and I know with surety that these things which I have spoken of are true. That you may seek for that same surety is my prayer in the name of Jesus Christ, amen.
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Sources: Come, Follow Me–For Individuals and Families, p. 136; The New Testament Made Easier, Part 2, Volume 3, by David J. Ridges, 166; Excerpts from General Conference, April 2008, “Gaining a Testimony of God the Father; His Son, Jesus Christ; and the Holy Ghost,” by Elder Robert D. Hales, Of the Quorum of the Twelve Apostles.