God's Own People

you also in him, hearing the word of truth, the good news of your salvation, in Him also believing, were sealed of the promised Holy Spirit, which is the pledge of our inheritance to the extent of redemption of his own, to the extent of the praise of His glory. (Ephesians 1:13-14) 

The word his own περιποίησις (peripoiēsis, from perí, "about. concerning" and poiéō, "making") properly, make one's own; completely obtain, i.e. as a full possession.* Paul writes God "chose us in Him before creating the world to exist holy, blameless in his presence, in love, predestining us for adoption as his through Jesus Christ..." (Ephesians 1:4) God is holy, hating unrighteousness, and has chosen us, called us to be holy. (1 Peter 1:15-17) So how can we be in his presence and be loved? "... God is love, in this, the love of God is revealed in us because God sent his only begotten Son into the world so that we live through him." (1 John 4:8-9) In Christ God has made a way for us to be holy, blameless in his presence, in love. God purposed in Christ, before creating the world to have a people of his own. 

now, God's the one establishing us together with Christ and anointed us, the one also sealing us and giving the Spirit in our hearts, of pledge. (2 Corinthians 1:21-23)

God made Adam in his image, and because of his one-act, all mankind fell. But God through his great love, when we were dead in our trespasses and sin was rich in mercy and made us alive in Christ. (Ephesians 2:1-5) When we believed we were sealed with the promised Holy Spirit as a pledge until the redemption of his own. Now, His own refers to that made in Christ, a new creation, the ones in which he puts his Spirit within, the ones born anew of the Spirit, made alive and made to be partakers of his divine nature, holy, so to be in his presence and be loved. (John 3:6, 2 Corinthians 5:17, Ephesians 2:5, 2 Peter 1:3-4, Ephesians 1:4)

for this is the covenant which I establish the house of Israel after these days says the Lord, 'I will put my laws in their minds and inscribe them in their hearts and I will be their God and they will exist my people.'(Hebrews 8:10)

Jesus establishes a new covenant in his blood through which is the fulfillment of this prophecy, that God would put his Spirit within us and write his laws on our hearts and minds, from the least to the great they will know him, and he will never remember again their sins. (Hebrews 8:11-12) How do I know that I am His own? There are three that testify; spirit, blood, and water, if receiving the testimony of men, the testimony of God is greater because it is the testimony regarding his Son. (1 John 5:8-9) This is what we receive in His Son, in him we are blessed with all the spiritual blessings in the heavenlies; adopted, redeemed, favored, forgiven, sealed as his own. (Ephesians 1:3-14) "... receiving the Spirit of adoption, in whom we cry Abba Father! The Spirit himself testifies with our spirit because we exist children of God." (Romans 8:15-16) The Spirit also groans in us, knowing the state of the weakness of this body of death, as we await the redemption of our body by which we will experience the glorious freedom as sons of God, thus the Spirit is a pledge of the redemption of His own. (Romans 8:23, Ephesians 1:14)

who gave himself for us to redeem us from all lawlessness and to purify for himself a chosen people, zealous for good works. (Titus 2:14)

His own people refer to the promise given to Abraham that all peoples and all nations would be blessed in the offspring, Christ. The kingdom of God reflected in the church, is made up of all ethnic groups, of all peoples, races, color. (Genesis 12:1–4, Galatians 3:7–9, Matthew 28:18–20, Revelation 7:9–11) What we have in common is Jesus in whom we are a new creation, His own, and, "who gave himself for us to redeem us from all lawlessness and to purify for himself a chosen people." We can say as God's children we are a nation, Israel, where there is no distinction of outward ethnicity, but all are Jews inwardly circumcised of the heart by the Spirit, sons of Abraham through faith. (Romans 2:28-29, Galatians 3:7)

"Now you are a chosen offspring, a royal priesthood, a holy nation, a people to extent of his own making, in order that you may declare the goodness of the one calling you out of darkness into his wonderful light." (1 Peter 2:9) His own, implies we are chosen to be like Him, holy. Therefore those he chose, he predestined to be conformed to His image, his own he called, these he justifies, and these he glorifies. (Romans 8:28-30) 

and through him existing mediator of a new covenant, in this manner the ones called receive the promised eternal inheritance, death came into existence to the extent redemption of transgressions, to the extent of the first covenant. (Hebrews 9:15)

Jesus establishes a new covenant in His blood, where all the promises of God are yes in him and on which account we say amen to God in relation to glory. (2 Corinthians 1:20) He the mediator of this covenant so those called receive the promised eternal inheritance. (Hebrews 9:15) A covenant where we are bound to Christ, to serve in newness of Spirit, not the old written code. (Romans 7:1-6) He does away with the first to establish the second, to fulfill God's promises to the chosen, and he gives the promised Holy Spirit as a pledge of our inheritance until the redemption of his own. 

Since then we have these promises, beloved, cleanse yourselves from every defilement of flesh and spirit, finishing holiness in the fear of God. (2 Corinthians 7:1)

Christ gave himself for us to redeem us from all lawlessness and to purify for himself a chosen people.  "Since we have these promises, beloved..." What promises? We are his own. "For we are the temple of the living God, just as God said 'I will dwell in them and walk with them, and I will be their God and they will be my people.'" (2 Corinthians 6:16-17) Yes, the work was finished on the cross, which brings about these promises, therefore since we have these promises, we are finishing holiness in the fear of God. This implies the perfecting work of Christ in the purification of the body of sin.* Here we see another testimony of God, that we are His own.