Ephesians 1:13-14 (KJV)
13 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,
14 Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.
4:30, "And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption."
Scripture states that through believing the Gospel of Christ, the gospel of our salvation, we are sealed unto the day of redemption which is our promise and guarantee that it will happen. What is the redemption?
Romans 8:23, "And not only they, but ourselves also, which have the firstfruits of the Spirit, even we ourselves groan within ourselves, waiting for the adoption, to wit, the redemption of our body."
The redemption is when we are fully adopted. We should always be careful about building a doctrine based upon one verse in the Bible.