We speak of four types of sons at the seder: one wise, one wicked, one simple, and one who does not know to ask. To the wise son, we explain all the details of Pesach observance. To the simple son, who asks nothing more than, "What is all this?", we give a simple answer. So far so good; we answer according to the level of understanding and interest of the child. To the wicked son, however, we give a sharp answer -- ha'keh es shinav/blunt his teeth. Not really in consonance with even tough love; just hit him in the teeth. And the one who doesn't know to ask? We are told that we need to start, we need to open him up. And what is the guidance we are given to start the conversation? The very same answer that we use to blunt the teeth of the wicked son! We started off with clear and understandable direction from our Sages, but we end with confusing and seemingly counter-productive advice! But Chazal speak in riddles and hints; they are ...
This is a paraphrase of the pasuk in t'hillim 84:7 -- "mei'chayil el chayil" -- which means "from strength to strength". In this case, it is my thoughts and ideas to those who are strong enough to be interested :)