At first glance, Chad Gadya is a kind of light hearted song whose sole purpose is to provide an entertaining ending to the seder.  Yet, in order to truly understand its meaning an analysis of the structure of the seder is required.
 
In general terms, the seder is divided into two parts.  The first half which precedes the seder meal deals with the past-a retelling and reenactment of the Exodus from Egypt.  The second half, which follows the seder meal, deals with the future-words of praise and song that complete redemption come soon.
 
It is because of this separation that we break the matzah at the onset of the seder.  Matzah is the symbol of redemption.  One half remains on the table as we recount the past event, and the second half-- not coincidentally the larger half representing the hope of the greater redemption which is yet to come-is set aside to be eaten at the end of the meal, the section that looks toward the future.
 
If you take a look at most haggadahs, the bulk of commentary focuses on the first half of the seder, and there is little discussion about the last half.  But this section deserves just as much attention.  It begins with the eating of the afikomen, that second half of matzah.  This part of the seder is called tzafun.  Tzafun literally means hidden, and is always associated with redemption whose time is unknown to us.  The word tzafun sounds like tzafon which means north.  It is said that the Messiah will come from the north.
 
Tzafun is followed by the Grace After Meal, the prayer of thanksgiving for food eaten during the main course.  This prayer, that we recite after each meal during the year, interestingly includes the prayer that God send to us Elijah the Prophet who announces the coming of the Messiah. 
 
We emphasize Elijah’s presence though at the seder immediately after the Grace, when we open the door for Elijah, symbolic of our yearning for the Messiah.  For the Messiah to arrive, we cannot sit on our hands-we have to do our share and open the door.
 
What follows is the Hallel.  Appropriately, the first two paragraphs of the Hallel, which deal with redemption from Egypt, are recited prior to the meal.  The last paragraphs deal with the future, the hope that God will bless us (Ye-Varech Et Beit Yisrael) with redemption and hope.  Thus, these paragraphs are recited after the seder meal.
 
And after reciting these words, we begin reciting the Greater Hallel.  This Great Hallel contains prayers of hope that all of humankind will be redeemed.  Included in this set of prayers is the famous Nishmat Kol Chai-may the soul of all living beings bless you O Lord.
 
With this we drink wine, celebrating the hope of future redemption just as we drank wine after telling the Passover story before the meal.
 
The seder has now officially come to an end as the statement – Chasal Siddur Pesach is read.  But as in all powerful experiences, a feeling of exhilaration remains.  In the case of the seder, this feeling is expressed through an ultimate encounter with God.  The encounter, called Nirtzah, which means may God hear our words favorably, includes songs that allow our hearts and souls to soar heavenward.
 
One such song is Va-yehi Ba-chatzi Ha-laylah, literally and it was in the middle of the night.  Night is the symbol of exile.  The middle of the night represents the exile of the exile, the deepest darkness.  As we sing these words, we're certain that somehow, no matter how dark, light will come.  We continue with Adir Hu which speaks of the hope that God rebuild the Temple speedily.  We move on with the famous Echad Mi Yodeihu in which we proclaim some fundamentals of faith including the Oneness of God, so crucially necessary for redemption.
 
And here we conclude with the Chad Gadya, a playful story which demonstrates how, in the long chain of natural events, God prevails.  The goat is devoured by the cat and the cat is bitten by the dog and the dog is slain by the stick and the stick is consumed by fire, and the fire is extinguished by water which is drunk by the ox, which is slaughtered by the slaughterer whose life is taken by the angel of death.  But in the end, it is God who overcomes that angel.
 
One wonders why is this deep message written in metaphor.  It may be to teach that so much in Jewish history cannot be understood as it occurs, it can only be deciphered in hindsight.  And it may be that the Chad Gadya is written playfully and humorously to teach that to survive against the odds requires the ability to laugh.  Our very existence is difficult to believe, and in that sense almost funny.
 
As we sit down to the seder this year, our hearts, minds and souls are with our people in Israel.  We will be focusing not only on past redemption, but on the hope for future redemption.  And we will sing Chad Gadya, that funny little song to remind us to laugh.  The Chad Gadya, the song written in metaphors to remind us that even though we don’t understand—one day we will.

Shabbat Shalom,

Rabbi Avi Weiss