Sever the root of SIN

Quote "No one sins out of duty. We sin because we want to. Sin promises happiness, and we buy the lie. So how can the root of sin be severed in our lives? The penalty of sin must be paid by the righteous blood of Christ. And the power of sin must be broken by banking on the promises of Christ." by John Piper

I've finish Jesus Christ Disciple Marker and now on the next QT material Future Grace by John Piper.
Really find the above quote quite interesting and true, we did what we do everyday because it's promises us happiness and joy. But how much of the things we are enjoying are not pleasing to God? In the end, does the things that we dwell in really bring us to a place that it had promise?
I've been quite engrossed playing Farmtown in facebook and it had taken quite alot of my time with God, it's fun at first and I think it's also relaxing and de-stressing. But in the end, emptiness is what I felt. Usually when this feeling comes we would try to move on to other interesting de-stressing activities, slowly it'll eat into our time with God.
Jesus said," When you drink the water that I had given, you will never be thirsty again." Once you had a taste of true and pure honey water, you would never be satisify by sweeten drinks.
once you had taste the joy and satisfaction that Jesus had given, you would never be able to find anything that even come close to it.