Shulchan Arukh, Orach Chayim Siman 115
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
טעם ברכת אתה חונן. ובו סעיף אחד
מפני שמותר האדם מן הבהמה הוא הבינה והשכל קבעו ברכת אתה חונן ראש לאמצעיו' שאם אין בינה אין תפלה :
The reason for the blessing of "Ata Chonein" ["You grace humanity with knowledge", the fourth blessing of the weekday Amidah]. Containing 1 S'if
Since humanity's advantage over animals is understanding and intellect, they established the blessing of "Ata Chonein" as the first of the [the Amidah's] middle [blessings] since if we do not have understanding, there is no [capacity for] prayer.