We were slaves to Pharaoh in Egypt, and the L-rd, our G‑d, took us out from there with a strong hand and with an outstretched arm. If the Holy One, blessed be He, had not taken our fathers out of Egypt, then we, our children and our children's children would have remained enslaved to Pharaoh in Egypt. Even if all of us were wise, all of us understanding, all of us knowing the Torah, we would still be obligated to discuss the exodus from Egypt; and everyone who discusses the exodus from Egypt at length is praiseworthy.

It happened that Rabbi Eliezer, Rabbi Yehoshua, Rabbi Elazar ben Azaryah, Rabbi Akiva and Rabbi Tarphon were reclining [at a seder] in B'nei Berak. They were discussing the exodus from Egypt all that night until their students came and told them: "Our Masters! The time has come for reciting the morning Shema!"

Rabbi Eleazar ben Azaryah said: "I am like a man of seventy years old, yet I did not succeed in proving that the exodus from Egypt must be mentioned at night until Ben Zoma explained it: "It is said, `That you may remember the day you left Egypt all the days of your life;' now `the days of your life' refers to the days, [and the additional word] `all' indicates the inclusion of the nights!"

The sages, however, said: "`The days of your life' refers to the present-day world, and `all' indicates the inclusion of the days of Mashiach."

Blessed is the Omnipresent One, blessed be He! Blessed is He who gave the Torah to His people Israel, blessed be He!


haggadah Section: Maggid - Beginning
Source: http://www.chabad.org/holidays/passover/pesach_cdo/aid/661624/jewish/English-Haggadah.htm