The wicked child is considered wicked because he will only observe a commandment if he knows its reason. The answer we give the wise child, then, is to teach him all the commandments until the very end of the Seder – don't eat after the Afikomen. We teach him all the commandments even if they are hukkim, statutes, or laws for which there is no rational explanation. The wicked child, on the other hand, asks for an explanation for the mitzvot since he will only observe the commandments if he thinks they make sense to him. We tell him that God took us out of Egypt because we accepted the commandments freely. Had he been in Egypt, he would not have accepted these commandments on faith and, therefore, he would not have been redeemed.