Men must realize the depth of their depravity. It is not that men just sin a little here & there, get annoyed when cut off at a parking place, etc.
Romans 1-3 clearly describes the natural man. And it is a rotten, sorry description of those who are totally depraved.
Here is some of it:
being filled with all unrighteousness, wickedness, covetousness, maliciousness; full of envy, murder, strife, deceit, malignity; whisperers, backbiters, hateful to God, insolent, haughty, boastful, inventors of evil things, disobedient to parents, without understanding, covenant-breakers, without natural affection, unmerciful: who, knowing the ordinance of God, that they that practise such things are worthy of death, not only do the same, but also consent with them that practise them.
Wherefore thou art without excuse, O man, whosoever thou art that judgest: for wherein thou judgest another, thou condemnest thyself; for thou that judgest dost practise the same things. And we know that the judgment of God is according to truth against them that practise such things. And reckonest thou this, O man, who judgest them that practise such things, and doest the same, that thou shalt escape the judgment of God? Or despisest thou the riches of his goodness and forbearance and longsuffering, not knowing that the goodness of God leadeth thee to repentance? but after thy hardness and impenitent heart treasurest up for thyself wrath in the day of wrath and revelation of the righteous judgment of God;
. . .
What then? are we better than they? No, in no wise: for we before laid to the charge both of Jews and Greeks, that they are all under sin;
as it is written,
There is none righteous, no, not one;
There is none that understandeth,
There is none that seeketh after God;
They have all turned aside, they are together become unprofitable;
There is none that doeth good, no, not so much as one:
Their throat is an open sepulchre;
With their tongues they have used deceit:
The poison of asps is under their lips:
Whose mouth is full of cursing and bitterness:
Their feet are swift to shed blood;
Destruction and misery are in their ways;
And the way of peace have they not known:
There is no fear of God before their eyes.
Now we know that what things soever the law saith, it speaketh to them that are under the law; that every mouth may be stopped, and all the world may be brought under the judgment of God: because by the works of the law shall no flesh be justified in his sight; for through the law cometh the knowledge of sin.
But now apart from the law a righteousness of God hath been manifested, being witnessed by the law and the prophets; even the righteousness of God through faith in Jesus Christ unto all them that believe; for there is no distinction; for all have sinned, and fall short of the glory of God; being justified freely by his grace through the redemption that is in Christ Jesus: whom God set forth to be a propitiation, through faith, in his blood, to show his righteousness because of the passing over of the sins done aforetime, in the forbearance of God; for the showing, I say, of his righteousness at this present season: that he might himself be just, and the justifier of him that hath faith in Jesus. Where then is the glorying? It is excluded.