Musar zu Dewarim 4:31

In connection with the debate in the Talmud (Shabbat 55a) whether זכות אבות, reliance on the merits of our patriarchs is still effective today, and if not, when it ceased to be so, the author makes the following observations: Tosafot quote a verse proving that even nowadays, i.e. after the destruction of the second Temple, this merit has not expired, and that we mention it in our prayers in order to remind G–d of it. I believe (author) that there is a difference between someone saying: "Please remember so and so," and someone saying: "Please do not forget so and so." The opinions in the Talmud which try and determine the merit of the forefathers ceased to be effective refer to G–d no longer actively remembering the merit of the patriarchs but simply not having forgotten them. The author of our prayer therefore refers to the merits of our forefathers כלא היו, "as if they had never existed," as distinct from "never having existed, having been used up." This is the difference between אין, and כאין. The חכמים mentioned in our prayer are the twelve sons of Jacob, all of whom accumulated powerful merits, so much so that Solomon describes them as a source of joy to their father (Proverbs 10,1). We also have a verse in Proverbs 24,3: בחכמה יבנה בית, "a house is built by wisdom," which is a reference to the house of Jacob. There used to be a period when the merits of the forefathers were constantly on G–d's mind. This was when the High Priest wore the breastplate. During those years the knowledge of what G–d desired flowed to us through the אורים ותומים, the oracle contained in that breastplate. Nowadays, alas, we are as if bereft of knowledge, i.e. כבלי מדע.