Towards the end of the Seder we move away from reliving the past and focus on the future. We express our deepest longing for the arrival of the Messianic era.
At the end of times, we are not even going to talk about the Exodus from Egypt because those miracles will be entirely overshadowed by what God has in store for us.
Not only must we thank God for all the kindness he bestows upon us, but we should also search for the hidden layers of Divine goodness, as taught in the Haggadah.
It is taught that the mitzvah of Korban Pesach emphasizes the unique bond between God and the Jewish people as well as the covenants that He made with us.
As we clean our homes for Passover, also we must search our hearts and our deeds. We must take stock and engage in self-reflection, judging where we can improve.
The word for "weaken" in Hebrew is "Tash." Take a three-cornered cookie, each representing one of the three forefathers, and you have "Haman tash" - "Haman was weakened."