חָכָם מָה הוּא אוֹמֵר? מַה הָעֵדוֹת וְהַחֻקִּים וְהַמִשְׁפָּטִים אֲשֶׁר צִוָּה ה’ אֱ-לֹקֵינוּ אֶתְכֶם? וְאַף אַתָּה אֱמָר לוֹ כְּהִלְכוֹת הַפֶּסַח: אֵין מַפְטִירִין אַחַר הַפֶּסַח אֲפִיקוֹמָן.

The wise son of the Hagaddah asks, “What are the laws of testimony, the metarational laws, and the more intuitive laws which Hashem our G-d has commanded you?” The wise son already knows much about the structure of halakhah, he is implicitly asking for a breakdown by asking for the laws by category: The eidos are comprehensible to people, but only after being taught the background of what it is they commemorate. Chuqim are laws that are beyond human comprehension, that we keep out of loyalty to and trust in the One Who commanded them. And mishpatim are laws that make intuitive sense based on human notions of law and ethics.

The answer we are told to give him is to “tell him like the laws of Pesach. Do not eat dessert after the Pesach [offering].” Usually this is understood to mean that you are to teach him all the laws of Pesach up to the very last one — do not eat after eating from the qorban.”

The Sefas Emes points out that this explanation is quite a stretch. It doesn’t say “teach him the laws of Pesach until” the one about not eating afterward. Rather, it says, “teach him kehilkhos haPesach, like the laws of Pesach, one may not eat…”

Why isn’t one supposed to eat after eating from the Pesach offering? Because you should be left with the taste of the mitzvah in your mouth.

The Sefas Emes explains that this is the point we must teach the Chacham. He is very focused on the intellectual pursuit of understanding the mitzvos of the night. With that fixation, he might miss experiencing the Seder, the lessons that can only be learned by living through it, rather than trying to comprehend it. Torah study is important, but it can not supplant the changes one undergoes by actually performing the individual mitzvah.
Therefore we teach him that all of Torah is “like that law of Pesach: do not eat dessert after eating the Pesach offering.” Savor the experience, the taste of the mitzvah.