The Union Haggadah, ed. by The Central Council of American Rabbis , at sacred-texts.com
The wise son eager to learn asks earnestly: "What mean the testimonies and the statutes and the ordinances, which the Lord our God hath commanded us?" To him thou shalt say: "This service is held in order to worship the Lord our God, that it may be well with us all the days of our life".
The wicked son inquires in a mocking spirit: "What mean ye by this service?" As he says ye and not we, he excludes himself from the household of Israel. Therefore thou shouldst turn on him and say: "It is because of that which the Lord did for me when I came forth out of Egypt". For me and not for him, for had he been there, he would not have been found worthy of being redeemed.
p. 21 p. 22
The simple son indifferently asks: "What is this?" To him thou shalt say: "By strength of hand the Lord brought us out of Egypt, out of the house of bondage".
And for the son who is unable to inquire, thou shalt explain the whole story of the Passover; as it is said: "And thou shalt tell thy son in that day, saying 'It is because of that which the Lord did for me when I came forth out of Egypt'".