But the Comforter, which is the Holy Ghost, whom the Father will send in My name, He shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you. – John 14:26

It is the Holy Ghost who manifests the Savior to us in the glory of His person; the complex character of His manhood and of His deity; it is He who tells us of the love of His heart, of the power of His arm, of the clearness of His eye, the preciousness of His blood, and of the prevalence of His plea. To know that Christ is my Redeemer, is to know more than Plato could have taught me. To know that I am a member of His body, of His flesh and of His bones; that my name is on His breast, and engraven on the palms of His hands, is to know more than the Universities of Oxford or Cambridge could teach to all their scholars, learn they never so well. Not at the feet of Gamaliel did Paul learn to say-“He loved me, and gave Himself for me.” Not in the midst of the Rabbis, or at the feet of the members of the Sanhedrim, did Paul learn to cry-“Those things which I counted gain, I now count loss for Christ’s sake.” “God forbid that I should glory save in the cross of our Lord Jesus Christ.” No, this must have been taught as he himself confesseth-“not of flesh and blood, but of the Holy Ghost.”

I need only hint that it is also the Spirit who teaches us our adoption. Indeed, and the privileges of the new covenant, beginning from regeneration, running through redemption, justification pardon, sanctification, adoption, preservation, continual safety, even unto abundant entrance into the kingdom of our Lord and Savior Jesus Christ-all is the teaching of the Holy Spirit, and especially that last point, for “eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love Him. But God hath revealed them unto us by His Spirit: for the Spirit searcheth all things, yea, the deep things of God.” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0315.cfm