There is no plague like the plague of an evil heart!
There is no misery like the wretchedness of 'conscious vileness'.
There are no sighs so long and so deep-drawn as those caused by indwelling sin. Though the righteous shall not weep always, yet they may weep bitterly.
Job 42:6 ... Wherefore I abhor myself, and repent in dust and ashes.
Isaiah 6:5 ... Then said I, Woe is me! for I am undone; because I am a man of unclean lips, and I dwell in the midst of a people of unclean lips: for mine eyes have seen the King, the Lord of hosts.