The famous scholar and philosopher, the Maharal of Prague, poses the following question. Why do we celebrate the freedom of the exodus of Egypt, if subsequently, in many following generations the Jews were persecuted and enslaved?
The answer is, that on Passover we are not only celebrating physical freedom, rather, when the Jew were enslaved in Egypt their entire psyche had become enslaved to the Egyptians depraved lifestyle. In fact the Torah teaches us, that even after witnessing many of the miracles of the exodus, 80% of the Jewish people did not want to leave Egypt, and died in the plaque of darkness.
However when G-d revealed himself at the time of the exodus, and subsequently at Mount Sinai, he liberated the Jews to the degree that there always remains one part of the soul that can never become enslaved, and remains above the various forms of spiritual enslavement that we have endured throughout our exile.
Thus the Maharal says, at the time of the exodus we have become quintessentially his people for eternity.
The Torah teaches, that by Passover we reach a new degree of freedom, may we all experience a most uplifting Passover and in this season of redemption, may we merit the ultimate redemption with Moshiach.