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As we approach Rosh Hashana, I wish to add a short addendum to this Insight.
It should be noted that there are commentators, including, for example, Ramban, who understand the word mitzvah in Devarim 30:11, and thus the subject of this entire section in the text, to be teshuva, repentance. The phrase Lo b'Shamayim Hee in Devarim 30:12, thus, is also to be understood as informing us, most importantly, that teshuva is within our grasp (just as the other commentators -- who understand the subject of this text to be the overall goal of Torah -- read this phrase, pursuant to its simple understanding, as informing us that general Torah proficiency and scholarship is within our grasp). Lo b'Shamayim Hee informs us that the attainment of the overall goals of Torah is within our reach. Similarly, it is also understood as informing us that we can meet the goals of teshuva. This is an important thought for us to maintain as we enter the Yomim Nora'im, the Days of Awe.
In the same manner, though, the specific thoughts presented in the Insight also can be read in the context of teshuva. Teshuva is a this world activity which demands work in recognition of ourselves. We indeed pray to God for assistance in the process but we must also recognize that Lo b'Shamayim Hee also informs us that success demands our effort in knowing and improving who we are. Teshuva is a difficult but attainable task. May we all, always, be successful in our endeavours in this regard.
1) A classic question on the story of Tanor shel Acknai: If we are not supposed to listen to a bat kol, why did God make one?