What are the implications of "ve'Atah Yisrael"?
Rashi: To inform Yisrael that, in spite of the many above-mentioned sins, Hashem still loves them and has compassion on them - and that all He asks from them is to fear Him.
Ramban and Seforno: (It is an opportunity for us to rectify our past wrongdoings, 1 - Seforno) to realize that the one thing that Hashem asks of us, to acquire Yir'as Shamayim by reflecting upon His greatness, is "le'Tov Lach" (in Pasuk 13) for our benefit 2 and not for His). 3
What are the implications of "Mah Hashem Elokecha Sho'el me'Imach Ki Im le'Yir'ah ... "
Rashi (citing B'rachos, 33b): We learn from here that the only thing that is not in the Hands of Hashem is Yir'as Shamayim. 1
Menachos 43b: We learn from here the obligation to a hundred B'rachos every day. 2
Mesilas Yesharim (introduction): This is the perfection of Avodah
I once heard that our Yir'as Hashem is so precious to Hashem because, the only thing that Hashem does not possess is the Midah of fear (EC). Even though most explain "Ka'as Oyev Agur" (32:27) to be fear, this is like an anthropomorphism; Hashem does not truly fear. (PF)
Rashi (Ibid.): We read "Mah" as if it was written 'Me'ah' (100). Da'as Zekenim
Is Yir'as Shamayim a small matter [that the Torah says, Hashem asks only
Brachos 33b: Indeed, l'Gabei (for) Moshe, it is a small matter, 1
Ramban, Da'as Zekenim, Hadar Zekenim and Seforno: It refers to the words (in Pasuk 13) "le'Tov Lach" - for our own benefit and not for His. 2
Maharsha (33b): The simple Yir'as Shamayim, fear of punishment, is indeed easy, and it is bi'Yedei Shamayim; Hashem punishes others to instill fear in Bnei Yisrael! L'Gabei (for those near) Moshe, who saw his radiance and feared to approach him, it was simple to similarly fear Hashem. Awe of His greatness is a difficult matter, and it is not bi'Ydei Shamayim; it is Hashem's treasure house.
Rashi (citing Brachos, 33b) writes that everything is in Hashem's hands, except for Yir'as Shamayim. It says in Kesuvos 30a 'except for colds and heatstroke'!
Moshav Zekenim: 'Except for Yir'as Shamayim' refers to matters of the soul. Man needs to fix them. It says in Nidah 16b that at the time of conception, it is decreed if the child will be male or female, strong or weak, wise or foolish, poor or rich; it does not say 'Tzadik or Rasha', for this is in the person's hands. Yirmeyah (9:22,23) said that one may not pride himself for his Chachmah, Gevurah, or wealth, only for Yir'as Shamayim
Moshav Zekenim: The Yerushalmi (Sanhedrin 10:5) says that one cannot guard himself from heatstroke! That refers to one who needs to go outside. This requires investigation.