God hath sent forth the Spirit of His Son into your hearts… – Galatians 4:6

“God hath sent forth the Spirit of His Son into your hearts.” Here is a divine act of the Father. The Holy Ghost proceedeth from the Father and the Son: and God hath sent Him forth into your hearts. If He had only come knocking at your hearts and asked your leave to enter, He had never entered, but when Jehovah sent Him He made His way, without violating your will, but yet with irresistible power. Where Jehovah sent Him there He will abide and go no more out for ever. Beloved, I have no time to dwell upon the words, but I want you to turn them over in your thoughts, for they contain a great depth. As surely as God sent His Son into the world to dwell among men, so that His saints beheld His glory, the “glory as of the only begotten of the Father, full of grace and truth,” so surely hath God sent forth the Spirit to enter into men’s hearts, there to take up His residence that in Him also the glory of God may be revealed. Bless and adore the Lord who hath sent you such a visitor as this.

There are many professors who know nothing of this; they listen to us with bewilderment as if we told them an idle tale, for the carnal mind knoweth not the things that be of God; they are spiritual and can only be spiritually discerned. Those who are not sons, or who only come in as sons under the law of nature, like Ishmael, know nothing of this indwelling Spirit, and are up in arms at us for daring to claim so great a blessing: yet it is ours, and none can deprive us of it. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1435.cfm