The Lives Of The Wretched

Psalms 19
12 ....cleanse thou me from secret faults.
13 Keep back thy servant also from presumptuous sins; let them not have dominion over me: then shall I be upright, and I shall be innocent from the great transgression.

If you are a Christian, at some point in time, you will need to spend some time considering the wretched, sinful human condition.  Here is some food for thought:
 
Romans 7
24 O wretched man that I am! who shall deliver me from the body of this death?
25 I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin.

Strong's Reference For Wretched
1) enduring toils and troubles
2) afflicted, wretched

Augustine's Confessions, Book VI, Chap. XVI
Unto Thee be praise, unto Thee be glory, O Fountain of mercies! I became more wretched, and Thou nearer. Thy right hand was ever ready to pluck me out of the mire, and to cleanse me, but I was ignorant of it.

I wonder if, maybe, our understanding of our sinful nature is different now than it was in the time of David, in 39 A.D. or in 405 A.D.?

From Spurgeon's A Treasury Of David
God has made men to be so wretched in their consciences that they have been obliged to stand forth and confess the truth. Secret sinner! If thou wantest the foretaste of damnation upon earth, continue in thy secret sins; for no man is more miserable than he who sinneth secretly, and yet trieth to preserve a character.