As we move towards a godly state of righteousness we shed one sin after another until at last we are down to our pet sins... those we consider insignificant, and that give us personal pleasure, or reduce the pain of life. When we reach this point, and we refuse to let these hidden sins go, then our relationship with God stalls, and we feel a growing separation from Him. This can happen early on in our walk, but usually it occurs once all of the low hanging sinful fruit has been plucked from us. These deeply imbedded sins that we pray over time and time again will require spiritual surgery to extract them.