Eph 5:8-13 For you were once darkness, but now you are light in the Lord. Walk as children of light 9 (for the fruit of the Spirit[b] is in all goodness, righteousness, and truth), 10 finding out what is acceptable to the Lord. 11 And have no fellowship with the unfruitful works of darkness, but rather expose them. 12 For it is shameful even to speak of those things which are done by them in secret. 13 But all things that are exposed are made manifest by the light, for whatever makes manifest is light.
When there is light there will not be any darkness. When the dark clouds approach the world, the people who are living in the light will have light. The people of Israel did have light when the Egyptians are in darkness. The darkness was among their enemies and not on them but both of them lived in the same world. Likewise, when we are in this world full of darkness, we are the children of Light and the darkness will not have authority over us. The darkness can not cover the light, because they will be exposed. When the deeds of darkness are exposed the plans of the enemy are also exposed. Satan tactics against God’s children is to make them to believe that darkness is in them through flesh. But the word of God gives us the assurance that we are the children of Light. If we have light in us and our Lord said we are the light of the world, then how come darkness will be in us? It could surround us to consume us, but they will be exposed and defeated in the name of the precious Lord Jesus.