‘Flithy Man’ is a song about a man looking back on when he became a Christian; the stubbornness, and pain that came along with that.
The man clearly had some internal conflict, with wanting to do things on his own, but feels God is calling him to live another way. The song ends with the man recognizing that he is a filthy man, but also understands that the cross redeems him from that.
This song really captures an emotion for me. You can sense the internal conflict, of the man wanting to follow God, but at the same time pushing God away. I know it is a conflict I have experienced in the past, and many people probably have as well.