This kind of certainty involves a number of important truths to understand. And it Begins with some really Bad News
ALL HAVE SINNED Romans 3:23
Sin is anything we think say do or don't do that transgresses God's law and everyone, except Jesus has sinned.
That's bad news but the bad news gets worse
THE WAGES OF SIN IS DEATH
Death literally means separation. Physical death is separation from the body and the spirit. Spiritual death is separation from God and his goodness, kindness, love, joy and peace. The Bible calls this Hell and we have all earned it by our sin.
I think you would agree that's really bad news but remember there is good news as well.