Halacha:

Shabbat,  Shema,  Tefillah 

Machshava:

Shabbat,  Tefillah 

Description

Why is it that we change the paragprah at the onset of the blessings prior to Shema ONLY on Shabbat morning, and state that הכל יודוך והכל ישבחוך/EVERYONE is thanking and praising?