If we love God more than anything, then His laws (also known as His will) become our delight, because then we no longer fulfill them because God asks of us, but because we want to fulfill them.
If we truly (in deeds) love God, we can know Him. We do not change immediately at repentance, but through knowing God. Repentance is just the beginning of the journey, you have to go through it, you have to go through the door.