Ecclesiastes 12:12
12 My son, beware of anything beyond these. Of making umany books there is no end, and vmuch study is a weariness of the flesh.
Ecclesiastes 2:22–23
22 What has a man from call the toil and striving of heart with which he toils beneath the sun? 23 For dall his days are full of sorrow, and his ework is a vexation. Even in the night his heart does not rest. This also is vanity.