Another explanation: "My taking shall drip as the rain": not as the rain that comes from the south, which is all for blast, mildew, and curse; but as the rain which comes from the west, which is all for blessing. R. Simai was wont to say: Whence is it derived that just as Moses called heaven and earth to bear witness over Israel, so, he called the four winds of heaven? From "ya'arof as rain, etc." — This refers to the west wind, which is at the "back (oref [west]) of the world, and which is entirely a blessing; "My word shall flow as the dew" — This refers to the north wind, which renders the firmament pure as gold; "as winds (se'irim) upon the herbage" — This refers to the east wind, which stirs up ("mesa'ereth") the world as a demon (sair); "as showers upon the grass" — This refers to the south wind, which brings showers.
Another explanation: "My taking shall drip as the rain": R. Simai was wont to say: These four winds correspond to the four corners of heaven: The east (wind) is always propitious; the west, always detrimental; the north, propitious for wheat when it is one-third grown, and detrimental to olive trees when they blossom; the south, detrimental to wheat when it is one-third grown, and propitious for olives when they blossom. And R. Simai was wont to say: All the creatures created from the earth — their spirit and their body are from the earth (except for men, whose spirit [soul] is from heaven and his body from the earth.) Therefore, If a man learns Torah and does the will of his Father in heaven, he is like the celestial creatures, viz. (Psalms 82:6) "I said that you are gods, and all, children of the Most High." If he does not learn Torah and do the will of his Father in heaven, he is like the lower creatures, viz. (Ibid. 7) "But you shall die like Adam." And it is written (Ibid. 50:4) "And He shall call to the heavens from above and to the earth for din with him." "He shall call to the heavens from above": This refers to the soul; "and to the earth": This refers to the body. "for din with him" — "ledayein" (to deliberate) with him (in judgment). Thus, "Listen, O heavens (the soul), and hear, O earth" (the body). And whence is it derived that this speaks of the resurrection? From "My taking shall drip as the rain" (see "the four winds" above), it being written (Ezekiel 37:9) "From the four corners, come, O spirit, and blow into these slain ones that they may live!" And thus was R. Simai wont to say: There is no section in the Torah that does not deal with the resurrection, but we lack the strength to expound it.