Alma 31:38

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And the Lord provided for them that they should hunger not, neither should they thirst; yea, and he also gave them strength, that they should suffer no manner of afflictions, save it were swallowed up in the joy of Christ. Now this was according to the prayer of Alma; and this because he prayed in faith.

The Lord did not exempt his missionaries from afflictions, but he strengthened them to be able to bear them. He promised them perspective. They would recognize that preaching Christ is more important than being comfortable. They would suffer afflictions, not as a punishment, but as a way for them to bear testimony and witness for Christ. They would be comforted because they would know the purpose of their suffering. This can be true for all of us who bear witness of Christ. Our afflictions will be swallowed up in the joy of Christ.