Okay, but think about this:
Being obedient is a product of having faith/trusting God, which has to do with regarding God as trustworthy. So the greatest commandment is to Love God with all your heart mind and soul. This commandment must first be fulfilled to fulfill al others.
True worship is drawn out by the object of worship and is not discretionary. Those who know Him Love Him for Who He is as a Person, and therefore worship Him in all Truth. We know Him because He gave us of His Spirit. If I could decide to not Love Him, then I never truly knew Him nor loved Him. If I don't know Him then I cannot say I love Him, nor decide to Love Him. Therefore I did not decide to Love Him, He decided to reveal Himself and moved me to Love Him. I see Love on the cross and I am moved to believe that this is God's Son.