Howbeit when He, the Spirit of truth, is come, He will guide you into all truth – John 16:13

It is wonderful how the Holy Spirit can take a fool, and make him know the wonders of Christ’s dying love; and he does make him know it very quickly when he begins to teach him. Some of us have been very slow learners, yet the Holy Spirit has been able to teach something even to us. He opens the Scriptures, and He also opens our minds; and when there are these two openings together, what a wonderful opening it is! It becomes like a new revelation; the first is the revelation of the letter, which we have in the Book; the second is the revelation of the Spirit, which we get in our own spirit. O my dear friend, if the Holy Ghost has ever enlightened your understanding, you know what it is for Him to show the things of Christ to you!

The Holy Ghost sometimes shows Christ to us by His power of vivifying the truth. I do not know whether I can quite tell you what I mean; but I have sometimes seen a truth differently from what I have ever seen it before. I knew it long ago, I owned it as part of the divine revelation; but now I realize it, grip it, grasp it, or what is better, it seems to get a grip of me, and hold me in its mighty hands. Have you not sometimes been overjoyed with a promise which never seemed anything to you before? Or a doctrine, which you believed, but never fully appreciated, has suddenly become to you a gem of the first water, a very Koh-I-Noor, or, “Mountain of Light.” The Holy Spirit has a way of focussing light, and when it falls in this special way upon a certain point, then the truth is revealed to us. He shall take of the things of Christ, and show them unto you. Have you never felt ready to jump for joy, ready to start from your seat, ready to sit up in your bed at night, and sing praises to God through the overpowering influence of some grand old truth which has seemed to be all at once quite new to you? ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2382.cfm