Read D&C 67:10-14
10 And again, verily I say unto you that it is your privilege, and a promise I give unto you that have been ordained unto this ministry, that inasmuch as you strip yourselves from jealousies and fears, and humble yourselves before me, for ye are not sufficiently humble, the veil shall be rent and you shall see me and know that I am—not with the carnal neither natural mind, but with the spiritual.
11 For no man has seen God at any time in the flesh, except quickened by the Spirit of God. 12 Neither can any natural man abide the presence of God, neither after the carnal mind. 13 Ye are not able to abide the presence of God now, neither the ministering of angels; wherefore, continue in patience until ye are perfected.
14 Let not your minds turn back; and when ye are worthy, in mine own due time, ye shall see and know that which was conferred upon you by the hands of my servant Joseph Smith, Jun. Amen.
Discussion
Explain that Heavenly Father and Jesus Christ are exalted, perfect beings. Because they are exalted beings, a mortal being could not be in their presence, because exalted being can only be in the presence of perfect people. When Joseph Smith and others have been in Their presence, they had to be physically changed to be face-to-face with Them. Ask your children how jealousy, fear, and pride keep us from growing closer to the Lord.
Activity
Hide a picture of Jesus Christ behind a blanket. Explain to your children that the blanket represents the veil. When we die, we pass through the veil. In order to live with Jesus and Heavenly Father again, we need to walk a straight path by living righteously. Make a path on the floor, using tape or string. Have your children walk along the path to see Jesus again. Easy, right? Now, have your children start at the beginning of the path. This time, add obstacles to the path. Maybe a chair, pile of pillows, or a box they have to climb over. Call these obstacles jealousy, fear, and pride, and give examples of things or situations that they could/do experience these emotions. Explain that it is our job to climb over and defeat these obstacles the best that we can, and the Atonement of Jesus Christ will make us perfect so that we can live with Heavenly Father and Jesus Christ again.
Watch
The following video shows a clip from Elder Holland's talk "Be Ye Therefore Perfect...Eventually."
Here is our version of the activity