We know in the court of God’s final judgement, there is only one defense: the acceptance of Jesus Christ as personal savior. John 3:18, "There is no judgement against anyone who Believes in him. But anyone who does not Believe in him has already been judged for not Believing in God’s one and only Son."
We know the immediate human reaction is: I don’t need a savior, all is good, thank you.
We know God knows us. He knows that not one person is perfect no matter how good we may think we think we are, or others think we are. We were born fallen. We may be able to attempt to justify to ourselves, friends, family, or anyone who will agree that we are just fine. But that will not play at God’s judgement seat. Saved from unsaved will be separated.
We know that those of us who know Jesus Christ as personal savior (although we are still human and sinful) must tell others about this remarkable free gift of salvation. We cannot love our neighbors as ourselves without mentioning this spiritual reality.