“The time is fulfilled, and the kingdom of God is at hand. Repent, and believe in the gospel.” – Mark 1:15

“He who believes and is baptized will be saved; but he who does not believe will be condemned. – Mark 16:16

If you were in God’s stead, could you bear to be treated as you have treated Him? If you were all goodness and tenderness, and had borne with a creature now for thirty or forty years, how would you bear to see that creature still stand out, and even draw an inference from your gentleness to encourage him in his rebellion? Would you not say, “Well, if my longsuffering makes him think little of sin, I will change my hand. If tenderness cannot win him, I must leave him; if even my love does not affect him, I will let him alone. He is given unto his evil ways-I will cease from him and see what his end will be”? Oh that hearts may be touched with pity for their slighted Saviour, that they may seek His face! Here is the way of salvation: “Believe in the Lord Jesus Christ, and thou shalt be saved.” You know how the Master bade us put it. “Go ye into all the world and preach the gospel to every creature: he that believeth and is baptized shall be saved.” First, we are to preach faith, whereby we lay hold on Christ; then baptism, whereby we confess that faith, and own that we are dead and buried with Christ that we may live with Him in newness of life. Those are the two points He bids us set before you, and I do set them before you. Weary, but not quite wearied out, O impenitent man, I plead with thee! Though thou hast so often been pleaded with in vain, once more I speak with thee in Christ’s stead, and say-Repent of thy sin, look to thy Saviour, and confess thy faith in His own appointed way. If “the goodness of God leadeth thee to repentance,” then be sure of this, that the goodness of God will receive thee when thou dost repent, and thou shalt live in His sight as His well-beloved and forgiven child. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1714.cfm