I read Mark 2:18-28. Jesus told them that something NEW was happening. The Pharisees, scribes, wondering why in the world aren't your disciples fasting, observing the Sabbath. Why aren't they doing the routine thing that "holy" men do? Jesus explained that those laws and rituals were in place because He hadn't came. They were for us to get close to Him (God) and now that He (being GOD!) was there, there wasn't a point. The Sabbath was made for man, but Jesus supercedes it. Not that we should take that out of context (as having rest is still important and fasting is still important!) but Jesus is proving His deity and power.
I love to think about that Jesus is doing something NEW with our lives. Now that He's here there is no turning back to life before. If you do, you still can't be the same because the Lord won't leave us alone :) We can no longer be comfortable with sin and being stagnant. We have to grow and change b/c He is God and we must become increasingly like Him and less like us.