There are several passage which indicate we have light within ourselves;
*James 1
17 Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning.
Proverbs 20:27
27 The spirit of man is the candle of the Lord, searching all the inward parts of the belly
In Mormon theology God takes the light or intelligence and clothes it in pure spirit matter.
*without this light there is no life
Job 18
5 Yea, the light of the wicked shall be put out, and the spark of his fire shall not shine.
6 The light shall be dark in his tabernacle, and his candle shall be put out with him.
Job 33
30 To bring back his soul from the pit, to be enlightened with the light of the living.
James 2:26
26 For as the body without the spirit is dead, so faith without works is dead also.
Once the spirit which clothes the light leaves then the body dies.
*John 1
3 All were made by him; and without him was not any made that was made.
4 In him was life; and the life was the light of men.
9 That was the true Light, which lighteth every man that cometh into the world.
Matt 5
16 Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.
It was Jesus who placed in Adam 'the breath of life' within him to make him a living soul.
Isa 42:5
He/Yahweh that giveth breath unto the people upon it, and spirit to them that walk therein:
Zach 12;1
"the Lord...and formeth the spirit of man within him.
Luke 11
34 The light of the body is the eye: therefore when thine eye is single, thy whole body also is full of light; but when thine eye is evil, thy body also is full of darkness.
35 Take heed therefore that the light which is in thee be not darkness.
36 If thy whole body therefore be full of light, having no part dark, the whole shall be full of light, as when the bright shining of a candle doth give thee light.
That matches
Job 10:22
22 A land of darkness, as darkness itself; and of the shadow of death, without any order, and
where the light is as darkness.
1 John 1:5
5 This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.
The idea is that we are purging the darkness out of us.