When we identify a particular sin, we go to God and say, “Lord, I need this changed.” The problem is, we have so many layers of sin. … And, of course, the roots of that sin are wrapped around many others. So God begins to work way down deep on the whole complicated mess – separating out, discarding, disentangling. …
source:
God At Work! « Grace Looking Back
http://gracelookingback.wordpress.com/2012/10/05/god-at-work/