We are created as beings that know no other desire but to receive. We cannot, by nature of our creation want anything else. The more we get, the more we want. At some point along the way we to want not only what we can get from whomever is our benefactor, but we begin to want that very nature. At that point we begin to sense just how opposite we are to him, and the awareness of that gap is what we call shame.
Shame is a very powerful emotion.
In fact it is so powerful that it can literally bring people to take their own lives. When we are ashamed of something there is nothing we want more but to be relieved of that shame. A person seeking the Lord, who senses he's total selfishness opposite the absolute benevolence of the Lord, will do anything to get rid of that terrible feeling. In fact such a person would rather be dead than to live inside he's own wretched soul for just another minute. It is only at that point that we are finally ready to give up our nature in favor of the Lords'.