“It is that very Spirit
With our spirit,
So that we are
αὐτὸ τὸ Πνεῦμα συνμαρτυρεῖ τῷ πνεύματι ἡμῶν ὅτι ἐσμὲν τέκνα Θεοῦ.
Paul said that it is that very Spirit (αὐτὸ τὸ Πνεῦμα) bearing witness with (συνμαρτυρεῖ) our spirit (τῷ πνεύματι ἡμῶν) so that we are the children of God (ὅτι ἐσμὲν τέκνα Θεοῦ). Only the Pauline letters used this word συνμαρτυρεῖ, that means to testify or bear witness with. Paul explained that the Holy Spirit bears witness with our spirit. Thus, we are really the children of God. Paul continued on with the idea of the adopted sons of God, so that we have eternal life through Jesus and the Holy Spirit. Do you ever consider yourself as a child of God?