My Response: No! Kohelet cannot be interpreted in earthly qualities.
The stone [Lev HaEven, the stony heart) is our egoism, which we cannot move. This is our most difficult desire, which we cannot cope with, and Kohelet tells us how it can be used.
In general, Kohelet is a work with the left line in our soul. The soul consists of three lines: egoistic—left, altruistic—right, and on their correct connection we build a third line—our spiritual elevation.
As a plus-minus, right-left leg, attraction-rejection – everything in nature consists of two opposites, which, when properly combined, set in motion the mechanism of our movement. Any manifestation of life is built on the comparison of two opposites over some material.
Here, basically, we mean working with the left line, with egoism, which is constantly manifested on the part of the left line of the soul. Therefore, Kohelet talks about how to work with stones, “time to cast stones and a time to gather stones.”
Question: Such a pessimistic little book?
Answer: No way! It is a joy, a great joy, when you read this book because it speaks of states in which a person can use all his negative qualities specially created in him by the Creator in order to create Evel, bestowal.
This so-called “vanity,” this quality of bestowal, must be expressed out of itself, i.e., it is these stones that are the lowest, coarsest, most inanimate desires to transform into the quality of bestowal, connections with others.
And thus, experience the entire universe in these corrected qualities until its very last, most delicate manifestation. Because the heavier the quality you have to fix, the higher the quality of bestowal rises.
From Kab TV’s “The Power of The Book of Zohar” #12