Galatians 4 says that we are heirs - children - adopted into the family of God. As sons and daughters we have full inheritance in the kingdom of God. It says that because we are sons, "God sent the Spirit of His Son into our hearts, the Spirit who calls out 'Abba, Father'. So you are no longer a slave, but a son (daughter); and since you are a son, God has made you also an heir."
