Shema is a most beautiful mitzvah. Saying it every day we get quite proficient in its recital. What exactly are the requirements and the level of intent which is required for this mitzvah?

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Quick Review:
Levels of Importance: First Possuk, until Al Livavecha, first paragraph, entire shema
Intent to accept Hashem’s rulership
Discussion what to do if didn’t pay attention
Rebbi covered face and said shema during shiur