Gethsemane was so severe that we are told in scripture that the Savior fell on his face, and later had to be strengthened by an angel, and that he sweat drops of blood. The Savior himself said this about what he suffered, and that because of it we do not have to suffer as he did.
"For behold, I, God, have suffered these things for all, that they might not suffer if they would repent;
But if they would not repent they must suffer even as I;
Which suffering caused myself, even God, the greatest of all, to tremble because of pain, and to bleed at every pore, and to suffer both body and spirit—and would that I might not drink the bitter cup, and shrink—
Nevertheless, glory be to the Father, and I partook and finished my preparations unto the children of men." (D&C 19:16-19)
Glory be to the Father, for the gift of his Only Begotten Son, who ransomed us as scripture says, by his blood.
Those who are saved in the Celestial Kingdom are those whose garments are washed white in the blood of the Lamb.
And because of the atonement, we can be comforted and lifted in our trials, and forgiven of our sins. What a marvellous gift. That because he suffered, we don't have to.
Here is a slideshow about Gethsemane:
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Scripture is at https://www.lds.org/scriptures/dc-testament/dc/19.16-19?lang=eng
Picture is Gethsemane, by Adam Abram Art available at http://www.adamabram.com/gethsemane