When criticized and judged by the scribes and Pharisees because He was eating at a table filled with sinners and tax collectors, Jesus said, "I have come to call not the righteous, but sinners." (Mark 2:17) Who are the righteous? Who are the sinners? No man or woman knows themselves as a sinner apart from the convicting work of the Holy Spirit. We know ourselves and others as good people, moral people, decent people, but the general consensus does not speak of any of us being sinners.
Is it not true that being convicted of our sins is a spiritual experience? John 16:8 speaks of the Holy Spirit convicting people of their sins. One of the things the Spirit does is to help us see the truth about who we are. It could be said that His work in our heart enables us to not only see who we are, but who we are created to be. This reality does not just come to us because we have decided to consider it, but because of the Spirit's work. His work is like grace.
Grace comes to us long before we realize it is being given to us and so it is with the work of the Spirit. His work begins long before we are consciously aware of it. When we think about what it means to be convicted of our sins, we often think of Isaiah who became aware of the holiness of the Lord and cried out, "Woe is me! I am lost, for I am a man of unclean lips, and I live among a people of unclean lips; yet my eyes have seen the King, the Lord of hosts!" (Isaiah 6:5). Being convicted of our sins is akin to the spirit of David as he cried out to the Lord, "...I know my transgressions, and my sin is ever before me. Against You, You alone, have I sinned, and done what is evil in Your sight." (Psalm 51:3-4). When the Spirit shows us how we have separated ourselves from the God who brought us into being, it is not a moment of casual regret, but a moment of a broken heart.