Siman 115
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א מִפְּנֵי שֶׁמּוֹתַר הָאָדָם מִן הַבְּהֵמָה הִיא הַבִּינָה וְהַשֵּׂכֶל, קָבְעוּ בִּרְכַּת אַתָּה חוֹנֵן רֹאשׁ לָאֶמְצָעִיּוֹת, שֶׁאִם אֵין בִּינָה אֵין תְּפִלָּה.
1 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.