Through the Atonement, Jesus Christ took upon Himself every affliction the world has to offer. Whether it be the spiritual pain of sin, the physical pain of an injury, or the emotional pain of an aching heart, He has felt it all. In the Book of Mormon, the prophet Alma explains the purpose of this in Alma 7:12,
And he will take upon him death, that he may loose the bands of death which bind his people; and he will take upon him their infirmities, that his bowels may be filled with mercy, according to the flesh, that he may know according to the flesh how to succor his people according to their infirmities.
Succor simply means to support or to help. In this verse, Alma explains that Christ took (living before Christ’s mortal ministry, Alma speaks in future tense) upon Himself every pain and sickness so that He knows exactly how it feels, so that He knows exactly how to comfort us when we come upon those obstacles in our own lives.
Once Christ was lifted upon the Christ, He had endured everything, except one thing: complete loneliness. In order for the Atonement to be complete, Jesus Christ had to suffer the entire realm of afflictions. And so we read in Mark 15:34,
And at the ninth hour Jesus cried with a loud voice, saying, Eloi, Eloi, lama sabachthani? which is, being interpreted, My God, my God, why hast thou forsaken me?
Through all the hate and scourges, God had still been with Jesus. But now, hanging there on the cross, Christ felt His Father’s presence leave Him. Perhaps Jesus did not know that such a thing would happen, or perhaps He understood completely and still could not help but ask His Father, “Why hast thou forsaken me?”
There is no doubt in my mind that Heavenly Father was pained and grieved beyond comprehension at even the thought of having to leave His Only Begotten Son. It would not surprise me if our Father in Heaven hid himself in the deepest corner of the universe, so great was His anguish. But He knew that it had to be done. In order for the Atonement to be complete, Jesus had to experience the entire spectrum of sin and pain, which included knowing what it felt like to be completely alone, without even God at His side.
I know that this was done out of love. It was perhaps the hardest thing God has ever had to do, but He did it because He knew that it was the only way for His plan to succeed. I am grateful that my Heavenly Father let Jesus be, allowing Him to be able to succor you and me in our own afflictions no matter what they are.