The Lectures on Faith teach why the omniscience of God is necessary: “Without the knowledge of all things God would not be able to save any portion of his creatures; for it is by reason of the knowledge which he has of all things, from the beginning to the end, that enables him to give that understanding to his creatures by which they are made partakers of eternal life; and if it were not for the idea existing in the minds of men that God had all knowledge it would be impossible for them to exercise faith in him” ([1985], 51–52).
Elder Neal A. Maxwell explained that God must know all things in order to accomplish His work of bringing to pass our immortality and eternal life:
“Those who try to qualify God’s omniscience fail to understand that He has no need to avoid ennui [tedium] by learning new things. Because God’s love is also perfect, there is, in fact, divine delight in that ‘one eternal round’ which, to us, seems to be all routine and repetition. God derives His great and continuing joy and glory by increasing and advancing His creations, and not from new intellectual experiences.
“There is a vast difference, therefore, between an omniscient God and the false notion that God is on some sort of post-doctoral fellowship, still searching for additional key truths and vital data. Were the latter so, God might, at any moment, discover some new truth not previously known to Him that would restructure, diminish, or undercut certain truths previously known by Him. Prophecy would be mere prediction. Planning assumptions pertaining to our redemption would need to be revised. Fortunately for us, however, His plan of salvation is constantly underway—not constantly under revision. …
“In a very real sense, all we need to know is that God knows all!” (All These Things Shall Give Thee Experience [1979], 14–15, 21).