Mishneh Torah

Hilchot Kriat Shema ch. 1

1. אף על פי שאין מצות ציצית נוהגת בלילה, קוראין אותה בלילה, מפני שיש בה זכרון יציאת מצריים; ומצוה להזכיר יציאת מצריים ביום ובלילה, שנאמר “למען תזכור את יום צאתך מארץ מצריים, כול ימי חייך” (דברים טז,ג). 

Why isn’t remembering Yetziat Mitzraim every day a mitzva?

The fifth rule of counting Mitzvot is that one cannot count a purpose of a Mitzva as a Mitzva. In this case the context of this pasuk is the purpose of the Mitzvot of Pesach. Remembering Yetziat Mitzraim every day is not a stand-alone command, rather it is the the objective of a properly done Pesach.

The Seder is designed to produce a framework of Kabalat malchut shamayim which carries through into the entire year, as expressed on a daily basis in Kriat Shema. If our Seder doesn’t lead us to this ongoing recognition as a basis for Talmud Torah then its goal wasn’t achieved fully.

This idea of the Seder is identified at the beginning of Hallel “Hashem’s servants. Give praise!” Hashem’s servants instead of Pharoah’s servants.

2.ח) בשחרית פתח יוצר אור, וסיים מעריב ערבים לא יצא; פתח במעריב ערבים, וסיים ביוצר אור יצא. וכן בערבית אם פתח במעריב ערבים, וסיים ביוצר אור לא יצא; פתח ביוצר אור, וסיים במעריב ערבים יצא: שכל הברכות, הולכות אחר חתימתן.

What is the difference between an opening and closing of a Bracha. Why is the Bracha fulfilled if one confuses the opening but not if one confuses the closing?

The opening of a Bracha describes the phenomenon at length, it explores the various aspects of the idea, and, in this case, describes the joint phenomenon of creation as seen in cycles of light and dark. If one confuses the two beginnings all of the components are present, even if not expressed in the most perfect way for the time of say.

The closing summarizes the Bracha by expressing the essence of the praise. In this framework the two ideas are incompatible, and therefore saying the wrong one is a substantial distortion since you haven’t given the correct praise at all.