למה מוציאים טיפות יין בליל הסדר?

We pour for him the second cup, so that the children will ask why we drink the second cup before the meal. If the son has no wisdom, the father teaches him. If he has no son, his wife should ask him. If he does not even have a wife, he should ask himself. Even scholars should ask each other "what is different," etc. (And when the son or the wife asks, there is no need to say "what is different," but they may begin from "we were slaves.") And when one begins "We were slaves to Pharaoh," he should return the Seder plate, that on it are the matzot, before him, and read the entire Hagada. And when he reaches the matza or has to raise it, he should show it to those reclining so that they will be attached to the mitzva. (And some lift the matza which is like bread of affliction). And similarly when he reached "this maror." And when he reaches "therefore," everyone should lift his cup in his hand until the end of "Gaal Yisrael." (And some have the custom to throw a little bit from the cup with one's finger when one reaches "blood, fire, and pillars of smoke," and similarly when one mentions the plagues; in all 16 times. And the matza should be uncovered when one says the Hagada until "therefore," when he holds the cup in his hand. Then he should cover the matza.)