The moon reflects the light of the sun. The position of the sun is what determines the reflected 'shape' of the moon that night. For example, a crescent, full moon, etc. all depends on where the sun is in relation to the moon.
The moon has no light itself. It's not like a star, which has the capability to shine on it's on.
The parable of this is, just like the moon, we do not have any light on our own. We are only a reflection of God, if we believe in Jesus.
"So God created man in his own image, in the image of God he created him." Genesis 1:27
On our own we are only dark cratered beings. With the Holy Spirit we come to life, lit beings when we are filled.
This does not make us God, only what he created us to be.
"You are the light of the world. A city set on a hill cannot be hidden. Nor do people light a lamp and put it under a basket, but on a stand, and it gives light to all in the house. In the same way, let your light shine before others, so that they may see your good works and give glory to your Father who is in heaven." Matthew 5:14-16
