Miriam Webster defines adoption as "to take by choice into a relationship". Not only did God send His Son to pay the debt we could never pay, but he also adopts us as His own. As we watch the Gregoires bring Trey into their family, we can all catch a glimpse of the beautiful picture Paul paints by using the term adoption.
"The word adoption, like the word justification, refers not to a change in our disposition and character, but to a change on our status. It speaks of a revolution in our relationship with God. As unbelieving sinners, we were utterly alienated from him: total outsiders, as far as his family was concerned. Now we belong, and by using the term adoption, Paul is using formal legal language to remind us that our membership of our new family is absolutely secure. It can never be undone.
There is a parallel to all this in the story of Moses. The abandoned Hebrew baby, born as a slave under sentence of death, is taken into the palace by a royal princess, and formally adopted as her son. It is just so with believers in relation to God. He is committed to us. He has given us his name. He has made us his heirs, and solemnly pledged that as our heavenly Father, he will provide for us with the lavishness that befits his means as possessor of all the riches of glory (Philippians 4:19).
He has said, in effect, “From now on, you have nothing to worry about (Matthew 6:26). I will care for you (1 Peter 5:7), and if you do ever find yourself overtaken by anxiety, come and talk about it to me at once (Philippians 4:6–7). Always remember that I am your home, and that I will never disown you; and should you ever go astray, I will always take you back (Luke 15:20). My love will never let you go.”- (Donald Macleod from Desiring God)