Show the children the object covered by a piece of cloth.
Do you believe there is something under here? Why?
Let the children guess what they think the object might be. Then uncover the object. Point out that even though they could not see the object, they believed it was there.
Explain that even though we have not seen Jesus Christ, we believe he is there. We see evidence of his existence everywhere as we look at the world that he created, as we see the stars in the heavens, and especially as we read the scriptures. We also have prophets who have told us that they have seen him. Tell the children that today they will learn of someone from the Book of Mormon who had such great faith that he actually saw Jesus Christ.
Source: Lesson 29: Having Faith in the Lord Jesus Christ, Primary 3: Choose the Right B, (1994),138
Doctrine and Covenants 38:7-8
7 But behold, verily, verily, I say unto you that mine eyes are upon you. I am in your midst and ye cannot see me;
8 But the day soon cometh that ye shall see me, and know that I am; for the veil of darkness shall soon be rent, and he that is not purified shall not abide the day.
Doctrine and Covenants 84:119
119 For I, the Lord, have put forth my hand to exert the powers of heaven; ye cannot see it now, yet a little while and ye shall see it, and know that I am, and that I will come and reign with my people.
15 How do ye know of their surety? Behold, ye cannot know of things which ye do not see; therefore ye cannot know that there shall be a Christ.
21 And now as I said concerning faith—faith is not to have a perfect knowledge of things; therefore if ye have faith ye hope for things which are not seen, which are true.
JST, Hebrews 11:1
1 Now faith is the assurance of things hoped for, the evidence of things not seen.
6 And now, I, Moroni, would speak somewhat concerning these things; I would show unto the world that faith is things which are hoped for and not seen; wherefore, dispute not because ye see not, for ye receive no witness until after the trial of your faith.
8 But because of the faith of men he has shown himself unto the world, and glorified the name of the Father, and prepared a way that thereby others might be partakers of the heavenly gift, that they might hope for those things which they have not seen.
2 Corinthians 4:18
18 While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.