"In every generation one must look upon himself as if he personally had gone out of Egypt ." (Pesachim 116b)
Some 3300 years ago Hashem delivered us from Egypt , from slavery to freedom.
And if Hashem had not taken us out of Egypt then, we would still be slaves there now.
That is why we thank G-d every day all over again for our freedom, and we promise in our heart to use our liberty in the best possible way, chosen servants of the King of kings.