We 'serve' the Lord because He is so good. Make sin your master and then try to disobey and then the real fun begins and you will find out what a cruel slavemaster that it is along with your fellow slaves, they will do their due diligence to whip you into line. Try to make yourself the master of sin and you will eventually realize your delusion, possibly and sadly too late, many only realize it after they are one day 'put to bed' with a shovel. Know what I mean jelly bean?