We cannot live or worship without traditions. Traditions help us make life more predictable and manageable. They give worship a sense of purpose and recognizability. The problem comes when we let our traditions force out the things and will of God.
In Matthew's Gospel, we clearly see Jesus take on the huge traditional interpretation of the Law God had given to Israel. Jesus, as God with us, brings us in word and action a demonstration of what God intended from the Law. He challenges many of the accepted traditional practices and interpretations. He moves directly back to God's will.
For us to be true disciples, we must learn from Jesus what God's will is. Here, he reminds us that NOTHING, no teaching or tradition, can be allowed to replace the clearly stated will of God. Otherwise, those who are hungering to find God get left out and those who know all the little rules and traditions can feel smug and saved. Jesus came so the last could be first and the first last. When tradition crowds out the will of God, the truth is lost, from first to last!