All this is not to say that life in the covenant is free of challenge or that the obedient soul should be surprised if disappointments or even disasters interrupt his peace. If you feel that personal righteousness should preclude all loss and suffering, you might want to have a chat with Job.
This brings us to a second way in which our covenants supply strength—they produce the faith necessary to persevere and to do all things that are expedient in the Lord. Our willingness to take upon us the name of Christ and keep His commandments requires a degree of faith, but as we honor our covenants, that faith expands. In the first place, the promised fruits of obedience become evident, which confirms our faith. Secondly, the Spirit communicates God’s pleasure, and we feel secure in His continued blessing and help. Thirdly, come what may, we can face life with hope and equanimity, knowing that we will succeed in the end because we have God’s promise to us individually, by name, and we know He cannot lie (see Enos 1:6; Ether 3:12).
The Power of Covenants , Elder D. Todd Christofferson, Ensign, May, 2009