What did Jesus Christ do for me?
Latter-day Saints believe that Jesus Christ performed the Atonement for all of us. In Gethsemane and on the cross, He took upon Himself not only our sins but also our pains, afflictions, sorrows, and death. Because of Him, we can repent, be forgiven, receive strength in suffering, and eventually be resurrected. References: Atonement of Jesus Christ; Plan of Salvation; Alma 7:11–13; Isaiah 53.
This matters personally. Latter-day Saints understand the Savior’s suffering to mean that He knows how to help us in our darkest moments. When people speak of depression, grief, loneliness, fear, illness, or heartbreak, we believe He understands perfectly because He descended below all things and felt the full weight of mortal suffering. References: Atonement of Jesus Christ; Alma 7:11–13; Doctrine and Covenants 122:8.
How did this transpire? The Atonement unfolded in Gethsemane and was completed through His suffering and death on the cross, followed by His Resurrection. In Gethsemane, an angel appeared to strengthen Him. Yet in the deepest part of that sacrifice, He had to bear it in a way no one else could share. References: Atonement of Jesus Christ; Luke 22:39–44; Luke 22:43; Matthew 27:24–50.
Why did He cry, “My God, my God, why hast thou forsaken me?” The scriptures do not give a full explanation, so it is wise to speak reverently and carefully. Latter-day Saint teaching often points to two things: first, He was echoing Psalm 22:1; and second, in some sacred and terrible way, He experienced the aloneness of the Atonement on our behalf. His cry shows the depth of what He willingly endured to save us. References: Matthew 27:46; Mark 15:34; Psalm 22:1; Matthew 27–28 Student Manual; “None Were with Him,” Jeffrey R. Holland; “The Atonement: Our Greatest Hope,” James E. Faust.