What is the most powerful way how Hashem could have introduced Himself in the עשרת הדברות? Seemingly with "I am Hashem who created heavens and earth!" Yet, Hashem says, "I am Hashem who took you out of מצרים!" Why does Hashem feel that this accomplishment is more important for the אידן to know as they get the תורה?
Because, the רבי answers, the entire creation and the entire תורה is here for a איד to have the strength to break free from his limitations - his מצרים!
This is what we are celebrating every year anew as we head to מתן תורה on שבועות.