It directs itself towards the other. For this reason God created free beings to give them His glory and share with Him the divine joy in the Trinity. The first created beings were angels. That's why angels, as St. Gregory calls them, are secondary lights. Angels are secondary lights because they draw their light and life from God, as the moon receives its light from the sun.
Created beings are secondary lights.
Being the primary light, bestowing life is characteristic of God. The created beings as angels for example receive light and reflect it as secondary light. We humans are creatures who receive their life from God, the first light. So we can reflect His light and share the life we receive from Him. There is a parable in the Gospels about a woman who lost a coin, so left all the nine other coins she owned to look for this lost one.