The Torah tells us that in all generations we must convey to our children “that G‑d acted on my behalf when I went out of Egypt.” Our Sages learn from this verse that “in every generation, one is obligated to regard himself as if he himself has just come out of Egypt.”
Chassidus explains that freedom from Egypt is a constant and recurring miracle, and not just the natural and automatic state ever since the Exodus 3000 years ago.
The Zohar explains that the exodus from Egypt involved not only redemption from our physical slavery; the spiritual source of Egypt was entirely vanquished as well.
This is hinted at in the verse “For the Egyptians whom you see today, you will never see again.” Practically, this means that (even though the bondage in Egypt is the spiritual root from which all our subsequent exiles derived,) the Jewish people will never again be subjugated in a manner as extreme as the Egyptian bondage.
For this reason we continue to celebrate the holiday of Pesach despite having been subsequently exiled and forced into captivity in other lands multiple times, because the freedom achieved through the redemption from Egypt can never be undone.
Our eternal freedom from the possibility of another “Egypt‑like” exile defies nature, for in the natural order of the world a comparable exile is entirely possible. Hence, the guarantee of freedom that came with the Exodus is not a one‑time miracle, but a continuous, nonstop defiance of the natural possibility of enslavement. Therefore, in every generation, and indeed every single day, we can truly regard ourselves as having just been redeemed from Egypt.
—Likkutei Sichos, vol. 5, pp. 175–178
