Psalms 51:5

Psalms 51:5. Behold, I was shapen in iniquity; and in sin did my mother conceive me.

David has got further than seeing sin upon him, he sees that he is himself sinfulness, that his nature, his very being, is steeped and dyed in sin. The evil is, not merely that thou hast sinned, but that thou art a sinner. Sin would never come out of thee if it were not in thee. And, oh, what mine of sin, what a bottomless deep of sin, there is in human nature! No wonder that it bursts forth as it does. As the volcano is but the index of a mighty seething ocean of devouring flame within the bowels of the earth so any one sin is only a token of far greater sinfulness that seethes and boils within the cauldron of our nature: "Behold, I was shapen in iniquity; and in sin did my mother conceive me."