There is an important pattern in these verses:
Since we don’t see our Heavenly Father, we need messengers from Him to teach us about Him. When those messengers have gained our trust, we exercise faith in their words, which eventually leads us to a full understanding and knowledge of the gospel (see D&C 50:24). But the initial step is an act of pure faith: “You say there is a God, and I choose to believe you.”
Aaron’s joyful response to the king reminds me of Elder Holland’s response to a young man who expressed some insecurity because of his lack of certainty:
A 14-year-old boy recently said to me a little hesitantly, “Brother Holland, I can’t say yet that I know the Church is true, but I believe it is.” I hugged that boy until his eyes bulged out. I told him with all the fervor of my soul that belief is a precious word, an even more precious act, and he need never apologize for “only believing” (“Lord, I Believe,” General Conference, April 2013)
Today, I will choose to believe. I will also look for opportunities to honor others who are willing to believe in the face of uncertainty.