On St. Paul's Words in Romans 3: 9-17 (continued)

So that if you do not see that all the good you do comes from Jesus, then the good you do is your justification under the Law, and it is to you that Paul speaks in telling you that, in yourself, you are under sin.  If you think you are just in yourself, then Paul tells you that there is not any man just.  If you pride yourself on your understanding, then he tells you that there is none that understands.  If you pride yourself on your good will, then Paul’s words tell you that your will is not good, because there is none that seeks after God.  If you are in peace, as you think, because of your good works, then he tells you that all men have gone astray, that their lives are useless and vain, that there is none that does good, there is not so much as one.

Then if you would see what you really are in yourself, having seen that what you thought you were you are not, then again, let Paul tell you:  Your throat is an open sepulchre because the stench of corruption emerges from your mouth. Why? Because with that mouth the abundance of your heart speaks.  And what does it speak?  Your heart speaks the stench of self-love.  And because you are so in love with your own goodness, the goodness of others would be only a threat to your own divinity, and so Paul likens your mouth to that of a poisonous snake which hides the venom of detraction of others.  

For not loving God Who alone is the universal Good which all may share in peace and joy, you rejoice in your own private good which is therefore threatened by the good of others. And therefore, your mouth is filled with poison to destroy the good name of others which necessarily threaten your own. And because God Who loves you nevertheless continues to pursue you with His Spirit of Truth, to show you your corruption in order that you might turn to Him, you cannot understand His Goodness because you are so blinded that you can only understand your own goodness; and therefore, believing yourself cursed by a God Who is Love, you curse Him in your heart, in the bitterness of your heart, and therefore, this same cursing is on your lips, and not only of God, but of all those who, as God's instruments, teach you wittingly or unwittingly your corruption. And therefore, your feet which are the instruments of your will are quick to shed blood, to murder those whose sacrifice is acceptable, or at least appears so to your eyes. Therefore, yours is the way of murderers who cannot know the way of peace since in their hearts all goodness is ordered to their own goodness. And because the fear of God would perhaps turn you from these evil works, you have turned from the fear of God and have convinced yourself of your innocence. And thus what fear of God may still lurk within you is buried far from your eyes, that you may not see it.
Do you understand the answer to your question how Paul's words could possibly apply to a nice person like me?
Here it is briefly:  If you would know in what you delight, whether in Jesus’s justification of you, or in your own justification of yourself, then ask yourself now whether you see yourself as Paul has described those who are under the law. If you see yourself as he describes, then the Spirit of Jesus is your justification:  But if you do not see yourself as he describes, then you are blinded by your spirit, and what Paul says is true of you — only because there is no fear of God before your eyes, you cannot see what you are. Because you would save your life, you are losing it.