Ecclesiastes 2:19-21

Amplified Bible

¹⁹ And who knows whether he will be a wise man or a fool? Yet he will have control over all the fruit of my labor for which I have labored by acting wisely under the sun. This too is vanity (futility, self-conceit). ²⁰ So I turned aside and let my heart despair over all the fruit of my labor for which I had labored under the sun. ²¹ For there is a man who has labored with wisdom and knowledge and skill, yet gives his legacy to one who has not labored for it. This too is vanity and a great evil.