To reject Jesus Christ, the only begotten Son of God is to reject eternal life (John 3:16-18). It is unimaginalble and incomprehensible why anyone would reject eternal life.
“For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord” (Romans 6:23).
Jesus says: “The time is fulfilled, and the Kingdom of God is at hand: repent ye, and believe the gospel” (Mark 1:15).
“I came not to call the righteous, but sinners to repentance” (Luke 5:32). “For I came down from heaven, not to do mine own will, but the will of him that sent me” (John 6:38).
“Except ye repent, ye shall all likewise perish” (Luke 13:3).
“The wicked shall be turned into hell, and all the nations that forget God” (Psalm 9:17).
“Upon the wicked [God] shall rain snares, fire and brimstone, and a horrible tempest: this shall be the portion of their cup” (Psalm 11:6).
“The soul that sinneth, it shall die” (Ezekiel 18:20).