5:13 To their hurt - Because they frequently are the occasions both of their present and eternal destruction.

Ecclesiastes 5:13 Parallel Commentaries

There is a Blessedness in Reversion
Blessed are the poor in spirit. Matthew 5:3 Having done with the occasion, I come now to the sermon itself. Blessed are the poor in spirit'. Christ does not begin his Sermon on the Mount as the Law was delivered on the mount, with commands and threatenings, the trumpet sounding, the fire flaming, the earth quaking, and the hearts of the Israelites too for fear; but our Saviour (whose lips dropped as the honeycomb') begins with promises and blessings. So sweet and ravishing was the doctrine of this …
Thomas Watson—The Beatitudes: An Exposition of Matthew 5:1-12

How to be Admonished are those who Give Away what is their Own, and those who Seize what Belongs to Others.
(Admonition 21.) Differently to be admonished are those who already give compassionately of their own, and those who still would fain seize even what belongs to others. For those who already give compassionately of their own are to be admonished not to lift themselves up in swelling thought above those to whom they impart earthly things; not to esteem themselves better than others because they see others to be supported by them. For the Lord of an earthly household, in distributing the ranks and …
Leo the Great—Writings of Leo the Great

Results of Transgression
Prominent among the primary causes that led Solomon into extravagance and oppression was his failure to maintain and foster the spirit of self-sacrifice. When, at the foot of Sinai, Moses told the people of the divine command, "Let them make Me a sanctuary; that I may dwell among them," the response of the Israelites was accompanied by the appropriate gifts. "They came, everyone whose heart stirred him up, and everyone whom his spirit made willing," and brought offerings. Exodus 25:8; 35:21. For …
Ellen Gould White—The Story of Prophets and Kings