Musar על בבא מציעא 169:23

From all the above we arrive at the rule that there are two blessings represented by the two luminaries. One is the blessing of the Torah which comprises the letters of the Holy name of G–d, the written Torah, the light of which has largely been hidden; the other is the blessing which accrues to us through the expansion of Torah knowledge by means of the study of the oral Torah which has itself been blessed by the written Torah. This thought helps us to understand the two benedictions we recite when reading from the Torah. We read in Baba Metzia 85 that Rabbi Yehudah stated in the name of Rav that the sages had left the following verse (Jeremiah 9,11) unexplained. The prophet asks: "What man is so wise that he understands this? To whom has the Lord's mouth spoken so that he may explain it? Why is the land in ruins, laid waste like a wilderness with none passing through?" The prophets did not explain this verse either until G–d Himself provided the explanation when He said in the verse following: "Because they forsook the Teaching I had set before them." Rabbi Yehudah, quoting Rav, said that the sin the Jewish people were guilty of was their failure to pronounce a benediction before they commenced their Torah studies. Rashi comments that Rav deduced this from the apparently superfluous words: "which I set before them." The benediction that this Rabbi refers to is: אשר נתן לנו תורת אמת, "who has given us a true Teaching," which is part of the benediction everyone recites when he is called up to the Torah. The failure to introduce Torah study by a benediction is tantamount to declaring that the gift of Torah is not of much value. Thus far the Rashi on the subject.