Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God; but exhort one another daily, while it is called “Today,” lest any of you be hardened through the deceitfulness of sin. (Hebrews 3:12-13, NKJV.)
What is it about sin that makes it deceitful? Satan the devil, who got our first parents to sin against God by disobeying His command not to eat the fruit of the tree He forbade them to, has since deceived the whole world! (Revelation 12:9.) Not just a tiny minority but the entirety of mankind! As 1 John 5:19 echoes: “…the whole world lies under the sway of the wicked one [Satan].”
As the apostle Paul put it: “…for all have sinned and fall short of the glory of God” (Romans 3:23). Paul said further: “Therefore, just as through one man [Adam] sin entered the world, and death through sin, and thus death spread to all men, because all sinned” (Romans 5:12), for “the wages [consequence] of sin is death” (Romans 6:23).