Romans 8:14-16

For all who are allowing themselves to be led by the Spirit of God are sons of God. For you have not received a spirit of slavery leading again to fear [of God’s judgment], but you have received the Spirit of adoption as sons [the Spirit producing sonship] by which we [joyfully] cry, “Abba! Father!” The Spirit Himself testifies and confirms together with our spirit [assuring us] that we [believers] are children of God.