Musar su Salmi 81:11

[And in this manner I have explained the verse in Psalms 81:10: "There shall not be in you a strange god and you shall not bow down to a foreign god. (11) I am the L-rd your G-d who brought you up from the land of Egypt. Open wide your mouth and I will fill it." Now, ostensibly, it should first have been written "I am the L-rd your G-d, etc." and only then "There shall not be in you a strange god," as it is written in the Torah. Why is the order reversed? But, Chazal have told us (Shabbath 105b): "Which is the strange god in the body of a man? The yetzer hara." (In the beginning it incites him to commit transgressions which are not so severe; but, in the end, "transgression breeds transgression," and it permits him even to bow down to idols.) And the intent of the verse [in Psalms]: "I am the L-rd your G-d, etc." is: Have I not brought you up from the land of Egypt so that you receive the Torah, as it is written (Shemoth 3:12): "And this is the sign for you [Moses] that I have sent you. When you take out the people from Egypt, you will serve G-d on this mountain." For this [the receiving of the Torah] is the purpose of the exodus, as Rashi explains. Therefore, "open wide your mouth and I will fill it." This is like a rabbi's telling his disciple: "Open up your mouth and let your words shine forth." For the Holy One Blessed be He wishes to give each Jew a great share in the Torah. However, in truth, everything is dependent upon the power of the recipient, wherefore He says: "Open wide your mouth." That is, ready yourself to receive much, and I will fill it according to your widening. But this is prefaced by: When will this be fulfilled in you? When "there will not be in you a strange god," when the yetzer hara will not be a guest in your body. Then you will be able to open wide your mouth to Torah, and I will fill it. For it is to this end that I brought you up from the land of Egypt (As it is written (Ibid. 13:9): "And it shall be a sign upon your hand… so that the Torah of the L-rd shall be in your mouth.") But if there is a strange god in your body— that is, if it is full of lewd thoughts, G-d forbid, I will not be able to fulfill your wish to widen your mouth with Torah.