Sweet little Torah I just heard from R'Nissan Kaplan of the Mir Yeshiva. Why is it that we sing at the end of seder "Ehad mee yodeya?" "Who knows One?" Because all of our preparations and the entire seder should be training us to know immediately and automatically the answer to that question. Of course, G-d is ONE. G-d is Oneness! And I would add, not just to know the answer - but to experience the answer...to experience that oneness throughout our entire being!!