In whom (Jesus) you also trusted, after that you heard the word of truth, the gospel of your salvation: in whom also after that you believed, you were sealed with that Holy Spirit of promise, which is the down payment of our inheritance until the redemption of the purchased possession, unto the praise of His glory. Ephesians 1:13,14

God glorifies and perfects the believer (the purchased possession) whom He has purchased by His Son's (Jesus Christ's) Blood. Then the Holy Spirit bears witness with our spirit, that we are the children of God, (Romans 8:16) sealing the believer by His Holy Spirit, eternally marked as His own with a seal that cannot be broken.

Now He establishes us with you in Christ, and has anointed us, is God. Who has also sealed us and given the down payment of the Holy Spirit in our hearts. 2 Corinthians 1:21-22

And grieve not the Holy Spirit of God, whereby you are sealed unto the day of redemption. Ephesians 4:30

Seals were generally pressed into soft clay, with the seal came a message, promise, and ownership. We too should be as soft clay in the hands of the Potter, capable of receiving the impression of God. If our hearts are hard, how can we then receive the mark of God, becoming sealed by the seal of the Holy Spirit? We must allow God to soften our heart, knead us, shape, and mold us into the vessel that He can seal.

Seal - (noun) and impressed device used to authenticate a document; a stamp for impressing the device. (verb) authenticate, close, or secure with a seal.

Have we allowed the device of the Holy Spirit to stamp us with the divine mark of Jehovah, to be marked as one who rejects sin and walks in righteousness? Has the stamp of Jehovah been placed upon our vessel, being authenticated by the Holy Spirit as and adopted child of Jehovah? Have you become secured and sealed, knowing that you are His?

Once sealed "you have received the Spirit of Adoption" the Holy Spirit himself bears witness with our spirit, that we are the children of God. Eternally marked and sealed with a seal that no man or minion destined to hell can break.

We must remember this; the Holy Spirit is the inner assurance of God's revealed Truth in our life. The Holy Spirit opens our mortal mind to spiritual understanding and God's divine instruction. Without the Holy Spirit, anything spiritually true would fail to be understood by our own inept carnal mind. The word of God can only be understood through the enlightenment and revelation of the Holy Spirit. Without the Holy Spirit, all things become null and void, without form or purpose. Truth cannot be based upon man's defunct fleshly perception, bound by naturally corrupt reasoning, and completely void of divine Holy Truth. With the Holy Spirit no absolute Truth can be perceived or received by the flesh, we must reside in the Holy Spirit for Truth to be understood and acted upon in our lives.

God Bless, daniel