Listen

Moshe recounts the great event of Matan Torah as אתה הראת לדעת כי ה׳ הוא האלקים אין עוד מלבדו.  Klal Yisrael saw that there is nothing beside Hashem.  However, later on in the parsha, it says  שְׁמַ֖ע יִשְׂרָאֵ֑ל.  It is listening, not seeing.  Rav Hirsch points out this distinction.  Only during the period of the beginning of Klal Yisrael's existence was their relationship with Hashem forged with a total recognition of Hashem experienced through seeing.  However after that it is שמע ישראל, it is listening to the mesorah passed down through the generations that ensures our knowledge of Hashem.  It is our job to listen to the the בת קול יוצאת מהר חורב, to hear the message.  It is only in the future that we will be back to the stage of seeing, as it says in  the haftorah, וְנִגְלָ֖ה כְּב֣וֹד י״י֑ וְרָא֤וּ כׇל־בָּשָׂר֙ יַחְדָּ֔ו כִּ֛י פִּ֥י י״י֖ דִּבֵּֽר.