But ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels, To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect, And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel. – Hebrews 12:22-24

Brethren, our fellowship is with the Father, our God. To Him we have come through our Lord Jesus Christ. Moreover, in the power of the Spirit of God we realize the oneness of the Church both in heaven and earth, and the spirits of just men made perfect are in union with us. No gulf divides the militant from the triumphant; we are one army of the living God. We sometimes speak of the holy dead, but there are none such, they live unto God, they are perfected as to their spirits even now, and they are waiting for the moment when their bodies also shall be raised from the tomb to be again inhabited by their immortal souls. We no longer shudder at the sepulcher but sing of resurrection. Our condition of heart, from day to day, is that of men who are in fellowship with God, fellowship with angels, fellowship with perfect spirits.

We have come to Jesus, our Savior, who is all and in all. In Him we live, we are joined unto Him in one spirit; He is the Bridegroom of our souls, the delight of our hearts. We are come to Him as the Mediator of the new covenant. What a blessed thing it is to know that covenant of which He is the Mediator! Some in these days despise the covenant, but saints delight in it. To them the everlasting covenant, “ordered in all things, and sure,” is all their salvation and all their desire. We are covenanted ones through our Lord Jesus. God has pledged Himself to bless us. By two immutable things wherein it is impossible for Him to lie, He has given us strong consolation, and good hope through grace, even to all of us who have fled for refuge to the Lord Jesus. We are happy to live under the covenant of grace, the covenant of promise, the covenant symbolized by Jerusalem above, which is free, and the mother of us all. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1888.cfm