New Jerusalem is the holy city (Revelation 21:2), Jesus Christ is the Holy One, and in Him we are God’s saints, God’s holy people. God chose us to be holy, called us with a holy calling, sealed us with the Holy Spirit, and gives us the renewing of the Holy Spirit.
Hebrews 10:10 says “we have been sanctified through the offering of the body of Jesus Christ once for all.” This speaks of a fact accomplished by the Lord and applied to us.
Hebrews 10:14 says “by one offering He has perfected forever those who are being sanctified.” This speaks of His gradual application (with our cooperation) of the fact in all our being and to all our living.
Hebrews 2:11 says “both He who sanctifies and those who are being sanctified are all of One, for which cause He is not ashamed to call them brothers.” This does not speak about the accomplished fact but about the ongoing application of the fact. This is based on the accomplished fact and brings us into the reality and experience of the fact.
Spiritual facts, and their imputation to us, are objective. The permeation of these facts through our being and their outworking in our living are experiential, subjective. Objectively we have the holiness of the holy New Jerusalem. Subjectively we are gradually being infused with the holiness of New Jerusalem. God will accomplish His purpose and we will be with Him in the holy city.