For you were once darkness, but now you are light in the Lord. Live as children of light (for the fruit of the light consists in all goodness, righteousness and truth) and find out what pleases the Lord. Have nothing to do with the fruitless deeds of darkness, but rather expose them (Eph 5:8-10).

Every component of God’s salvation done for us is creation. Just as this universe was created from darkness to light, we were saved from darkness to light. We were made light to live as children of light doing good works of light.

For we are God's workmanship, created in Christ Jesus to do good works, which God prepared in advance for us to do (Eph 2:10).

God first started a good work in us, and has prepared in advance for us to do the same good works. In fact, the same God will carry it on to completion.

… being confident of this, that he who began a good work in you will carry it on to completion until the day of Christ Jesus (Phil 1:6).

As we have already seen, Paul, in writing this letter to the Ephesians, had in mind the stories of creation in Genesis. The metaphorical analogy you find in the expressions he uses as well as the contents of his arguments cannot be ignored, and you can see easily that it is not accidental, but intentional. The story that lies behind chapter 3 of this letter is the story of Noah. Apparently, Paul sees himself as Noah. Note that this letter was written when he stayed in his own rented house in Rome as a prisoner preaching the kingdom of God to those who visited him.

For this reason I, Paul, the prisoner of Christ Jesus for the sake of you Gentiles-- Surely you have heard about the administration of God's grace that was given to me for you, that is, the mystery made known to me by revelation, as I have already written briefly (Eph 3:1-3).

A mystery was revealed to Noah concerning the flood and how his family together with the animals would be saved. In the same way, it was through God’s revelation that the mystery of the salvation of the Gentiles was made known to Paul.

This mystery is that through the gospel the Gentiles are heirs together with Israel, members together of one body, and sharers together in the promise in Christ Jesus. I became a servant of this gospel by the gift of God's grace given me through the working of his power (vv. 6-7).

A part of the revelation given to Noah was the blueprint of the ark—its length, width, height, etc. (Gen 6:15-16). In the same way, Paul discusses the blueprint of the ark—the house and the temple in which Christ dwells with his love. He prays in the following way:

And I pray that you, being rooted and established in love, may have power, together with all the saints, to grasp how wide and long and high and deep is the love of Christ, and to know this love that surpasses knowledge--that you may be filled to the measure of all the fullness of God (vv. 17-19).

It is important to realize that the Noahic covenant is the third one of the seven major covenants in the Bible. Just as the earth was created in six days, which were divided into two sets of three days (the first set consists of Day 1, Day 2, Day 3, and the second one Day 4, Day 5, Day 6), the first six covenants can be divided into two sets. The seventh one was the special covenant through Jesus Christ just as the seventh day was a special day, which was set apart from the rest. There was a break between the third one and the fourth one as the Noahic covenant was the renewal of the first covenant in Gen 1 (see Gen 8:15-9:17), and the world came to have a new start with that covenant. In the same way, Paul ends, in a rather unusual way, the first part of his letter at the end of chapter 3 with a doxology in the middle of his letter:

Now to him who is able to do immeasurably more than all we ask or imagine, according to his power that is at work within us, to him be glory in the church and in Christ Jesus throughout all generations, for ever and ever! Amen (vv. 20-21).