Charles Ellicott Commentary Ecclesiastes 2:21

"For there is a man whose labor is with wisdom, and with knowledge, and with skilfulness; yet to a man that hath not labored therein shall he leave it for his portion. This also is vanity and a great evil." — Ecclesiastes 2:21 (ASV)

Equity. —Rather, skill, success (Ecclesiastes 4:4; Ecclesiastes 5:7). The noun is peculiar to this book. The corresponding verb occurs in Ecclesiastes 10:10; Ecclesiastes 11:6; Esther 8:5.