Parashat Ekeb includes the second paragraph of our daily Shema recitation ("Ve'haya Im Shamo'a"), in which the Torah promises that G-d would reward our observance of the Misvot with material prosperity. Hashem says that if we observe His commands, "I will provide the rain of your land in its time" ("Ve'natati Metar Arsechem Be'ito" – 11:14 ). Rashi comments: "You did what is incumbent upon you, so I, too, will do what is incumbent upon Me." The question arises as to what prompted Rashi to make this remark, and how this enhances our understanding of the verse. Is it not obvious that Hashem here is promising adequate rainfall as a reward for our compliance with His commands? What does Rashi seek to clarify? A brilliant explanation of Rashi's comment was offered by the late Rebbe of Lubavitch. He suggested that Rashi was addressing a question that arises from a comparison between this verse and an earlier verse which similarly promises rainfall as a reward for Misva observance. In the beginning of Parashat Behukotai (Vayikra 26:4), G-d pronounces that if we obey His commands, "I shall grant your rainfall in its time" ("Ve'natati Gishmechem Be'ito"). There, Hashem promises to provide "Gishmechem" – "your rainfall," whereas here, in Parashat Ekeb, He promises "Metar Arsechem" – "the rain of your land." In other words, Parashat Behukotai speaks of "our rainfall," as though we are given some kind of special rain, while Parashat Ekeb speaks of the land's rain, the rain that the land naturally requires. The clue to understanding this discrepancy, the Rebbe explains, is found in Rashi's opening comments to Parashat Behukotai. There Rashi writes that the blessings described in that section are promised if "Tiheyu Amelim Ba'Torah" – the people "toil" and invest intensive efforts in Torah study. Here in Parashat Ekeb, by contrast, the Torah speaks of a time when Beneh Yisrael simply obey the Torah, but are not necessarily striving for more, applying themselves diligently to Torah learning. In Parashat Behukotai, then, the Torah refers to an exceptionally high spiritual level, in reward for which G-d promises not just rainfall, but "your rain" – a supernatural rain that is especially catered to our needs, that falls at precisely the right time and precisely the right manner that works the best for us. The rainfall promised in Parashat Ekeb, however, is a natural rainfall that will suffice to provide the food we need, but not beyond that. The Rebbe explained that this is Rashi's intent in making the comment, "You did what is incumbent upon you, so I, too, will do what is incumbent upon Me." Rashi anticipates the question of why this verse uses the expression "Metar Arsechem," as opposed to the verse in Parashat Behukotai, which uses the verse "Gishmechem." The answer, Rashi is telling us, is that the Torah speaks here of Beneh Yisrael doing "what is incumbent" upon them – without striving for more. In Parashat Behukotai, the Torah promises the special, supernatural rain that Beneh Yisrael deserve when they not only fulfill their basic obligations, but passionately pursue spiritual greatness by devoting their time and efforts to the intensive study of Torah. In Parashat Ekeb, Beneh Yisrael are described as merely satisfying their requirements, and so although they are of course worthy of significant rewards, they do not earn the special reward of "Gishmechem." In this brief remark, then, Rashi teaches us to always strive for more, to reach beyond the simple fulfillment of our religious obligations, and to pursue excellence in our service of Hashem.