Treasury of Scripture Knowledge
And not just the world, but even we [Christians] ourselves, who have the firstfruits of the Holy Spirit [i.e., the first installment of our inheritance from God] also groan within us, eagerly waiting to be adopted as [God's] children, and receive back our bodies [i.e., in the resurrection].
2 Corinthians 1:22
He has placed His seal of ownership upon us by giving us the down payment of the Holy Spirit [to live] in our hearts.
2 Corinthians 5:5
Now God is the One who has prepared us for this very thing [i.e., the receiving of a new body to live in]. He has [also] given us the Holy Spirit as a down payment. [Note: This refers to the gift of the indwelling Holy Spirit as being a guarantee that we will receive the balance of our inheritance in the form of a new body].
You [Gentiles] also, who are in Christ, after having heard the message of truth, the good news about your salvation, and [after] believing in Him, were sealed [i.e., as evidence of ownership] with the promised Holy Spirit. [or, "the Holy Spirit who brings promises"].
And do not grieve God's Holy Spirit by whom you were sealed [i.e., given evidence of God's ownership] until the day of redemption [i.e., until you receive your new body in heaven. See 1:14].
1 John 4:13
This is [one way] to know we live in [fellowship with] God and that He lives in our hearts: [It is] because He has given us His Holy Spirit [to live within us, See 3:24].
2 Corinthians 1:12
For this is what we boast of: Our conscience testifies that we have conducted ourselves in the world, and especially toward you, in holiness and godly sincerity, not with human wisdom, but with the favor of God.
1 John 3:19
And this is how we will know that we are following [God's] truth, and will have assurance [of it] in our hearts and before God [as well].
1 John 5:10
The person who [sincerely] believes in God's Son has the evidence [of it] within his heart, [confirming God's testimony]. The person who does not believe God [i.e., what He says about Jesus], accuses Him of lying, because he has not accepted the [irrefutable] testimony of God concerning [the identity and mission of] His Son.
For all of you are children of God through your faith in Christ Jesus [as God's only Son].