Romans 8:14-17

Certainly, all who are guided by God’s Spirit are God’s children. [15] You haven’t received the spirit of slaves that leads you into fear again. Instead, you have received the spirit of God’s adopted children by which we call out, “Abba! Father!” [16] The Spirit himself testifies with our spirit that we are God’s children. [17] If we are his children, we are also God’s heirs. If we share in Christ’s suffering in order to share his glory, we are heirs together with him.