Musar su Deuteronomio 22:8

King David, peace be upon him, said in Tehillim (119:37), “Avert my eyes from seeing vanity, cause me to live in Your ways.” A person must know that many things depend on sight. Therefore it seems to me that if upon arising from sleep one’s gaze falls upon the house, one should reflect that the Holy One Blessed is He gave us the mitzvah of affixing a mezuzah to the entryway and the mitzvah of erecting a ma’akeh (a parapet) around the roof, as it is written, “And you shall make a parapet for your roof” (Devarim 22:8). And if upon going out the doorway he encounters clean animals, fit to be offered as sacrifices, let him reflect that the Holy One Blessed is He commanded us to offer sacrifices. And if he encounters impure domesticated or wild animals let him reflect that it is forbidden to consume them. Similarly, if he meets a gentile let him reflect that it is forbidden to intermarry with them. In short, each person should engage in reflection according to his knowledge and learning. This is a very great matter, for in this way one clothes his eyes with sanctity regarding everything they behold.

“So that you do not bring bloodguilt in your house” (Deuteronomy 22:8). [This is a negative commandment against] placing a bad dog or a rickety ladder inside one’s home.

Adam ruined this state of affairs by interfering with the סוד היין, the mystical properties of the grapes. [I suppose that this is based on the tree of knowledge having been a grape bearing tree. Ed.] He followed an evil path by squeezing a cluster of grapes (and consuming its juice). Had he not done so, that "wine" would have remained in the state of what our sages call the יין המשומר בענביו, "the wine that remained preserved within its grapes (compare Berachot 34).” In that event he would have been like "the cistern that does not lose a single drop” [hyperbole for total recall, see Avot 2,11. Ed.]. He would have retained all the holiness that had been his when he was created. When Adam sinned, he did not only lose some of his former glory, fall from a "high roof" (to the ground), but he fell into a "very deep pit" (below the ground). This was a בור רק, an empty pit [allusion to the pit Joseph had been thrown in. Genesis 37,24], since it did not even contain the ingredients for the survival of the species. The species was wiped out at the time of the deluge as a direct consequence of Adam having polluted that "drop of sacred semen," and made it "evil smelling." Due to G–d's personal intervention, Noach was saved seeing he was righteous, and the righteous are the foundation of the universe. The present universe was founded by him as a result.