Ether 6:3

And thus the Lord caused stones to shine in darkness, to give light unto men, women, and children, that they might not cross the great waters in darkness.

Christ is the rock of redemption and the chief cornerstone, which shines in the darkness of a fallen world so we do not have to navigate mortal life in the dark.

Mormon 9:3

Then will ye longer deny the Christ, or can ye behold the Lamb of God? Do ye suppose that ye shall dwell with him under a consciousness of your guilt? Do ye suppose that ye could be happy to dwell with that holy Being, when your souls are racked with a consciousness of guilt that ye have ever abused his laws?

Our conscience makes us conscious of our guilt; but it also makes of conscious of the good we do. The light of Christ tells us not only what not to do but also what to do, both good and evil, things to avoid and things to embrace. Guilt is signal that we have done wrong. Peace is the signal that we have done right.

3 Nephi 18:16

And as I have prayed among you even so shall ye pray in my church, among my people who do repent and are baptized in my name. Behold I am the light; I have set an example for you.

We do not appreciate today the importance of light because we take it for granted. We live in a society of electric light available any hour of any day at the flip of a switch. The occasional power outage gives us an temporary glimpse into a dark world, but we endure the inconvenience because we know the lights will eventually come back on. They always do.

In the time of Christ, however, light was not so readily available. When the sun went down, it got very dark for the vast majority of people. Only the very rich could afford to burn oil lamps and tallow candles all night. For the rest, when the sun set, the day was done, and they had to wait for sunrise to receive light again.

Christ offers constant spiritual light. His light will never be dimmed by a blackout. Those who look to Christ will not be trapped by the long night of darkness. The light of Christ is always available at the flip of a switch called faith.

3 Nephi 8:20-21

And it came to pass that there was thick darkness upon all the face of the land, insomuch that the inhabitants thereof who had not fallen could feel the vapor of darkness; And there could be no light, because of the darkness, neither candles, neither torches; neither could there be fire kindled with their fine and exceedingly dry wood, so that there could not be any light at all;

When a person loses the light of Christ in his life, he can do nothing to create his own light. Christ is the Light, the only Light.