"...you were sealed with the Holy Spirit of promise, who is the guarantee of our inheritance until the redemption of the purchased possession, to the praise of His glory." Ephesians 1.13-14
Sealed with the Holy Spirit, guarantee of inheritance, redeemed possession, and the praise of His glory. In practical terms, the seal of the Holy Spirit is the GUARANTEE OF SALVATION of His servants until Jesus comes to rescue them. Just as jewels guarantee a loan, the servants of God are the jewels of His Private Treasure. To ensure that these jewels are untouched while they are temporarily serving in this world, He sealed them with His Spirit until the day of his final redemption.