Musar su Deuteronomio 28:8

The Tosafos (Ta’anis 8b) note that according to this passage damaging spirits have dominion over that which has not been counted, yet in Ta’anis (ibid..) it is taught that blessing is only found in that which has not been counted! The Sages derive this from the verse, “Hashem will command that there be a blessing for you in your storehouses (asamecha)” (Devarim 28:8). The Sages interpret: “In that which is hidden (samui) from the eye.” How are these two passages to be resolved? The Tosafos answer that while blessing is only found in that which is “hidden from the eye,” meaning that it has not been measured or counted, these spirits have dominion over the excess deriving from this blessing. Accordly, we can understand the meaning of the Midrash above. It was stated: “‘Hashem will bless you’ — with wealth.” Clearly this must refer to wealth that is “hidden from the eye” since, as we have seen, only there is blessing to be found. But if this is so, one might protest that the damaging spirits will have dominion over it! Therefore the Midrash continues: “‘And protect you’ — from destructive spirits.” That is, Hashem will grant special protection to prevent the spirits from having dominion over the excess wealth that comes of the blessing.