One of the principle things which distinguishes a regenerate person from an unregenerate one, may be likened unto two filthy rooms.
In one room, the blinds are raised and the sunlight streams in, exposing the filth all around.
In the other room, the blinds are lowered, and one walking through the room would be unable to discern its real condition.
Thus it is in the case of one who has been renewed by the Spirit: his eyes have been opened to see the awful filth which lurks in every corner of his heart.
But in the case of the unregenerate, though they have occasional twinges of conscience when they act wrongfully, they are very largely ignorant of the awful fact that they are a complete mass of corruption in the pure eyes of the thrice holy God.
Abraham acknowledged, "I am dust and ashes!" Genesis 18:27
Job said of himself, "I am vile!" Job 40:4
David admitted, "I am a worm!" Psalm 22:6
Isaiah confessed, "Woe is me! I am ruined!" Isaiah 6:5
Peter affirmed, "I am a sinful man, O Lord!" Luke 5:8
Paul considered himself, "The chief of sinners!" 1 Timothy 1:15