Which comes first, love or obedience?

Jesus said in John 14:15, "If you love me, you will keep my commandments." Jesus is saying that if we love Him, then our love for Him will cause in us a desire to obey Him. Love causes obedience. We cannot expect to successfully obey Jesus if we don't treasure Him. One application is this: if I am struggling to obey Jesus, perhaps the problem is that I am not cherishing Him.