…and he that hath not the Son of God hath not life. – 1 John 5:12

Let me tell you that for a hearer of the gospel not to believe on the Son of God must be, in the judgment of angels, a very astounding crime. How they must marvel when they see that God was made flesh to redeem the sons of men, and yet men do not believe in the incarnate Saviour! The “faithful saying, that Jesus Christ came into the world to save sinners,” is not depended upon by tens of thousands; though “it is worthy of all acceptation,” yet the mass of mankind give it no acceptation. What must angels think of such men? They no doubt understand the reason of it, that the mind is so perverted and corrupt that manhood is nothing better than a reeking sepulcher. Unbelief of the gospel is the great damning sin of man; the not laying hold of Jesus is the sin of sins.

Thou must have Christ, for He is the life of the soul, and without Him thou art dead in sin. “Oh! but,” perhaps you may say, “I have aways lived a chaste, upright, moral life; I have been attentive to religious duties; I could allege many particulars which might go to prove that I live unto God.” Ay, but all thy particulars, however well they might be alleged, would prove nothing in the teeth of such a text as this, “He that hath not the Son of God hath not life.” I tell thee, moralist, what thou art; thou art a corpse well washed and decently laid out, daintily robed in fair white linen, sprinkled plenteously with sweet perfumes, and wrapped in myrrh, and cassia, and aloes, with flowers wreathed about thy brow, and thy bosom bedecked by the hand of affection with sweetly blushing roses; but thou hast no life, and therefore thy destiny is the grave, corruption is thine heritage, and thy place of abode is fixed, “where their worm dieth not, and the fire not quenched,” for, “He that believeth not shall be damned.” Eternal Spirit, quicken them! They cannot have life unless they have the Son of God. O bring them to receive the Son of God. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0755.cfm