D&C 93:36 Tells us "The glory of God is intelligence, or, in other words, light and truth."
This establishes that Intelligence is light and truth.
Verse 29 says, "Man was also in the beginning with God. Intelligence, or the light of truth, was not created or made, neither indeed can be."
This establishes that we are an Intelligence and that we can't be made.
Verse 30 "All truth is independent in that sphere in which God has placed it, to act for itself, as all intelligence also; otherwise there is no existence."
This establishes that we wouldn't exist without freedom of choice. - So much for Satan's plan.
Verse 28 says, "He that keepeth his commandments receiveth truth and light, until he is glorified in truth and knoweth all things."
This (with what we have established so far) establishes that Our intelligence grows by learning and accepting to follow truth. As we are an intelligence, ourselves, we therefore exist more by following truth. Consequently sense says that the greater the commandments we have (that are followed) the greater our intelligence must become.
Verse 37 "Light and truth forsake that evil one."
Verse 39 says, "And that wicked one cometh and taketh away light and truth, through disobedience, from the children of men, and because of the tradition of their fathers."
From this we learn that opposing truth takes away intelligence - We exist less.
Verses 33-34 "For man is spirit. The elements are eternal, and spirit and element, inseparably connected, receive a fulness of joy; And when separated, man cannot receive a fulness of joy."
D&C 131 7-8 There is no such thing as immaterial matter. All spirit is matter, but it is more fine or pure, and can only be discerned by purer eyes; We cannot see it; but when our bodies are purified we shall see that it is all matter.
We have a spirit made of matter and a body made of courser material. Us having both of these increases our joy.
Hebrews 12:9 "Furthermore we have had fathers of our flesh which corrected us, and we gave them reverence: shall we not much rather be in subjection unto the Father of spirits, and live?"
God is the father of our spirits - so our spirit bodies were born also.
As we wouldn't exist without freedom of choice the decision to recieve spirit bodies had to be ours, as with physical bodies.