Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God. – John 3:5

The point of contact between a sinner and Christ is sin. The Lord Jesus gave Himself for our sins, He never gave Himself for our righteousnesses. He comes to heal the sick, and the point He looks to is our sickness. When a physician is called in he has no patience with things apart from his calling. “Tut, tut!” he cries, ” I do not care about your furniture, nor the number of your cows, nor what income tax you pay, nor what politics you admire; I have come to see a sick man about his disease, and if you will not let me deal with it I will be gone.” When a sinner’s corruptions are loathsome to himself, when his guilt is foul in his own nostrils, when he fears the death that will come of it, then he is really convinced by the Holy Spirit; and no one ever knows sin as his own personal ruin till the Holy Spirit shows it to him. Conviction as to the Lord Jesus comes in the same way. We do not know Christ as our Saviour till the Holy Spirit is put within us. Our Lord says-“He shall receive of mine, and shall shew it unto you,” and you never see the things of the Lord Jesus till the Holy Ghost shows them to you. To know Jesus Christ as your Saviour, as one who died for you in particular, is a knowledge which only the Holy Spirit imparts. To apprehend present salvation, as your own personally, comes by your being convinced of it by the Spirit. Oh, to be convinced of righteousness, and convinced of acceptance in the Beloved! This conviction cometh only of Him that hath called you, even of Him of whom the Lord saith, “I will put My Spirit within you.” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2200.cfm