Here's a truth you may not have considered, you WILL mourn over your sin. Either you will mourn over the conviction of your sins and repent of them or you will mourn over the consequences of your sins.
Either way you will be brought to deep sorrowful grief over your sins.
The issue at stake in the second of Jesus' pronouncements known as "The Beatitudes" is whether your sorrow over your sin will bring you God's comfort or His condemnation.
Will you recognize that you are poor in spirit? Will you agree with God about your total moral depravity, repent of it and cry out for His mercy? If you will you will know His comfort. If not you will face His judgment and wrath.
If you are heart-broken over your sinfulness you will know the comfort of His peace, His presence and His promises such as:
"Here is the message we have heard from him and announce to you. God is light. There is no darkness in him at all.Suppose we say that we share life with God but still walk in the darkness. Then we are lying. We are not living by the truth. But suppose we walk in the light, just as he is in the light. Then we share life with one another. And the blood of Jesus, his Son, makes us pure from all sin. Suppose we claim we are without sin. Then we are fooling ourselves. The truth is not in us. But God is faithful and fair. If we admit that we have sinned, he will forgive us our sins. He will forgive every wrong thing we have done. He will make us pure. I John 1:5-9
“Come to me, all of you who are tired and are carrying heavy loads. I will give you rest. Become my servants and learn from me. I am gentle and free of pride. You will find rest for your souls.Serving me is easy, and my load is light.” Matthew 11:28-30
"if My people who are called by My name will humble themselves, and pray and seek My face, and turn from their wicked ways, then I will hear from heaven, and will forgive their sin and heal their land." II Chronicles 7:14
These are just a few examples of the comfort God brings to those who are aware of their spiritual poverty and grieve over their sinfulness.
For those who trust in their own self-righteousness and who tolerate or celebrate sin in their hearts, they will never know His comfort.
"The wrath of God is being revealed from heaven against all the godlessness and wickedness of men who suppress the truth by their wickedness, since what may be known about God is plain to them, because God has made it plain to them. For since the creation of the world God’s invisible qualities — his eternal power and divine nature — have been clearly seen, being understood from what has been made, so that men are without excuse. For although they knew God, they neither glorified him as God nor gave thanks to him, but their thinking became futile and their foolish hearts were darkened. Although they claimed to be wise, they became fools and exchanged the glory of the immortal God for images made to look like mortal man and birds and animals and reptiles. Therefore God gave them over in the sinful desires of their hearts to sexual impurity for the degrading of their bodies with one another. They exchanged the truth of God for a lie, and worshiped and served created things rather than the Creator — who is forever praised. Amen. Because of this, God gave them over to shameful lusts. Even their women exchanged natural relations for unnatural ones. In the same way the men also abandoned natural relations with women and were inflamed with lust for one another. Men committed indecent acts with other men, and received in themselves the due penalty for their perversion. Furthermore, since they did not think it worthwhile to retain the knowledge of God, he gave them over to a depraved mind, to do what ought not to be done. They have become filled with every kind of wickedness, evil, greed and depravity. They are full of envy, murder, strife, deceit and malice. They are gossips, slanderers, God-haters, insolent, arrogant and boastful; they invent ways of doing evil; they disobey their parents; they are senseless, faithless, heartless, ruthless. Although they know God’s righteous decree that those who do such things deserve death, they not only continue to do these very things but also approve of those who practice them." Romans 1:18-32
Each of us will mourn over our sin. There is no doubt about that.
The question is, "Will you mourn over your sin, turn from your sin and seek His comfort? Or, will you remain in your sin and face the horrible eternal sorrow of God's wrath?