So that [your trust] may be, etc.: as it says, “He established a testimony in Yaakov, and placed a Torah in Yisrael, which He commanded our fathers to make known to their children, so that, etc., and they would place their assurance in G-d, and not forget, etc., and His mitzvos, etc.” (Tehillim 78:5–7). Its meaning: “He established a testimony”: these are Nevi’im and Kesuvim. “And a Torah”: this is the Torah. “Placed in Yisrael”: and the main purpose of His giving the Torah to Yisrael is that they put their trust in Hashem, as it says, “and they would place their assurance in G-d, etc.”; and also to tell it afterward to their children, as it says, “so that the last generation might know.” And this is because the main thing of all is complete bitachon, and it includes all the mitzvos, as it says, “and not forget, etc., and His mitzvos, etc.”