Shelak L'kha - To Do's and Why Do's

This Torah portion contains the passage that leads many Jews to wear a tallit.  Much of our religious life is represented by 'to do's,' but true meaning is found in our 'why do's.'  Why does one wear a tallit?  Why do people find so much meaning in doing certain rituals and what happens when we confuse 'to do' and 'why do?'