And I will put My spirit within you… Ezekiel 36:27
It is an instructive symbol when the Lord teaches us our death with Christ by burial in baptism: it is to our great profit that He ordains bread and wine to be tokens of our communion in the body and blood of His dear Son; but these are only outward things, and if they are unattended with the Holy Spirit they fail of their design. There is something infinitely greater in this promise-“I will put My spirit within you.” I cannot give you the whole force of the Hebrew, as to the words “within you,” unless I paraphrase them a little, and read “I will put My spirit in the midst of you.” The sacred deposit is put deep down in our life’s secret place. God puts His Spirit not upon the surface of the man, but into the centre of his being. The promise means-“I will put My spirit in your bowels, in your hearts, in the very soul of you.” This is an intensely spiritual matter, without admixturing of anything material and visible. It is spiritual, you see, because it is the Spirit that is given; and He is given internally within our spirit. It is true the Spirit operates upon the external life, but it is through the secret and internal life, and of that inward operation our text speaks. This is what we so greatly require… The good Spirit fires your heart; He penetrates your mind; He saturates your soul; He touches the secret and vital springs of your existence. Blessed Word! ~ C.H. Spurgeon
https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2200.cfm