But of Him are ye in Christ Jesus… – 1 Corinthians 1:30

Being in Christ you are of God. Not of the earth, not of Satan, not of the bondage of the law, not of the powers of evil, but of God are you; God’s husbandry, God’s people, God’s children, God’s beloved ones. “Ye are of God,” little children, “and the whole world lieth in wickedness.” On you hath God’s light shone, to you hath God’s life come, in you God’s love is made manifest, and in you shall God’s glory be fully revealed. What a dignity is this to be “of God!” Some have thought it a great thing to have it said, “These are they which are of the prince’s household,” and others have been yet more boastful when they have been pointed at as parts of an imperial court; but you are of the divine family, descended from Him who only hath immortality. “they shall be Mine, saith the Lord, in the day when I make up My jewels.” “For the Lord’s portion is His people, Jacob is the lot of His inheritance.” Of God, are you, every one of you who are in Christ Jesus: ye are Christ’s, and Christ is God’s. The Creator, the Upholder, the Sublime, the Invisible, the Infinite, the Eternal claims you. You have a part and lot with Him, and you are herein uplifted to the highest degree of exaltation because you are in Christ. Here, then, you have the dignity of the Christ life-it is of God, as its source is through God. Our life hinges upon union to our Lord. “Because I live, ye shall live also.” Out of Christ we abide in death, but in Christ we live, and we are of God. Our spiritual being, and the fact that our spiritual being is an exalted one, both hang upon this-that we are in Christ. Beloved hearer, there is no joy in this world like union with Christ. The more we can feel it, the happier we are, whatever our circumstances may be. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/0991.cfm