Idea that may help motivate your obedience. 

Write down things that motivate you to obey. A few stater suggestions are reward, discipline, joy, better relationships with family and friends, God's love, Jesus going to the Cross for me, etc... 

Now put that list at the end of your prayer list. When you finish praying then read your personal list of motivators. This can help you finish prayer with an added willingness to walk in His will. 

Also try to put this list in strategic places so they will be in front of you as encouraging reminders to serve God and others. Perhaps you could put it inside of your coffee cup cabinet so when you reach for your morning drink you see your motivators. Or perhaps in the medicine cabinet when you reach for your toothpaste. Just some thoughts - God bless. (If you find my devotions helpful consider subscribing to my wall posts)