This Zohar states that people are blocked in their mind because they only see the MATERIAL ASPECTS of this WORLD and they don't see the spirituals aspects of matters. Therefore constantly pursuing the physical and become blocked from the light. This leads them to accumulate more and more - only to de-accumulate latter in life and can't wait to discard all the physical items they have accumulated.
We recite this Psalm at a mourners' house to remind us of the futility of accumulating material things like the Weasel. How did the Psalmist know?
1.For the conductor, by the sons of Korah, a song.
2.Hear this, all you peoples; hearken, all You inhabitants of the earth.
3.Both the sons of "adam," and the sons of "ish," together rich and poor.
4.My mouth shall speak wisdoms and the thoughts of my heart are understanding.
5.I will bend my ear to a parable; with a lyre, I will solve my riddle.
6.Why should I fear in days of misfortune? The iniquity of my heels surrounds me.
7.Those who rely on their possessions and boast of their great wealth,
8.a brother cannot redeem a man, he cannot give his ransom to God.
9.The redemption of their soul will be too dear, and unattainable forever.
10.Will he live yet forever and not see the Pit?
11.For he sees that wise men die, together a fool and a boorish man perish, and leave over their possessions to others.
12.In their heart, their houses are forever, their dwellings are for every generation; they call by their names on plots of land.
13.But man does not repose in his glory; he is compared to the silenced animals.
14.This is their way; folly is theirs, and after them they will tell with their mouth forever.
15.Like sheep, they are destined to the grave; death will devour them, and the upright will rule over them in the morning, and their form will outlast the grave as his dwelling place.
16.But God will redeem my soul from the power of the grave, for He shall take me forever.
17.Fear not when a man becomes rich, when the honor of his house increases,
18.For he will not take anything in his death; his glory will not descend after him.
19.Because in his lifetime he blesses himself, but [all] will praise you, for you will benefit yourself.
20.You shall come to the generation of his forefathers; to eternity they will not see light.
21.Man is in his glory but he does not understand; he is compared to the silenced animals.