Fulness

He is here to call us into the fulness of life, following our vocation whatever it may be.

Which is the fulness of God himself.

For in him dwelleth all the fulness of the Godhead bodily.

Among those angels, the revelation listed "Moroni, whom I have sent unto you to reveal the book of Mormon, containing the fulness of my everlasting gospel; to whom I have committed the keys of the record of the stick of Ephraim".

The plan involved the spirits receiving bodies on earth and going through trials in order to learn, progress, and receive a "fulness of joy".

This reuniting of body and spirit results in a perfect soul that is immortal and eternal and capable of receiving a fulness of joy.