The pharisees constantly try to catch Jesus out; they ask questions, twist what he says and keep on trying to push him into a mistake. Today they ask what is the greatest commandment. This excessive focusing on points of Law and belief evades the real question, am I prepared to do what my conscince tells me to do and to obey God, or do I go on justifying myself?
Sometimes I see how fickle we humans are in our behaviour.....but Jesus knows this and still loves us. Our God is a good God!