When the Jewish People were about to leave Egypt, G-d commanded them to take a lamb, which the Egyptians worshipped as a god, and lead it through the streets to their homes. They tied the lamb to their bedposts, and three days later it was this lamb which served as the Pesach sacrifice. Miraculously, however, they were prevented from harming the Jewish People. They ground their teeth in fury but did not utter a murmur.
Freedom is something only a slave can really appreciate.
Only someone who emerges from the darkness to the light can have any idea of what light really is. Had the Jewish People never been enslaved in Egypt, we would never have experienced the true freedom that we commemorate on the festival of Pesach. In our long history, in times of the greatest darkness, when we have emerged, it has been to the greatest light. Our era has seen some of the darkest nights of our history. G-d has promised us that exactly when the night is darkest, He will bring the final redemption.