Avadim Hayinu is our response to the questions asked in the Ma Nishtana, and with this we begin the telling of the Exodus story, the main theme of the Maggid section of the Haggada. Before we delve into the depths of the story of the Exodus itself, the Haggada makes sure we realise how we are personally affected by this historical event. It reminds us that if not for the Exodus, we would still be slaves in Egypt! This passage also explains that the mitzva of telling the story of the Exodus is for everybody (even the old and wise), and the story should be told at length to make it impactful.