In the garden and on the cross, Jesus suffered the penalty justice demands for our sins, so that we can be redeemed if we repent. This gift is incalculable, and our need for it is absolute. But Jesus suffered more than this. Isaiah and Paul mention it (see Isaiah 53:4-5; Hebrews 4:15-16); Alma explains it.
Jesus somehow took upon himself all our sicknesses, pains, temptations, heartbreaks – everything we suffer. He now knows them all from the inside, “according to the flesh” (Alma 7:11-12.).
He not only knows generally how it feels to struggle with addiction, or to be chronically or terminally ill or love someone who is, or to be caught up in divorce and its aftermath, or to doubt or disbelieve or fear. Because of Gethsemane and Calvary, he knows exactly how these experiences feel to each of us. He not only walks the proverbial mile in our shoes; he walks every mile, and he knows exactly how our shoes feel on our feet.
Alma explains that this qualifies Jesus to judge us with mercy in the end. This experience also fully qualifies him to help us through all our difficulties. This part of the atonement, too, is a wondrous gift to us, from both the Son and the Father.