Ecclesiastes 2:23

New International Version

²³All their days their work is grief and pain;^(A) even at night their minds do not rest.^(B) This too is meaningless.

Ecclesiastes 2:23

King James Version

²³For all his days are sorrows, and his travail grief; yea, his heart taketh not rest in the night. This is also vanity.

¹²Be warned, my son, of anything in addition to them.

Of making many books there is no end, and much study wearies the body.^(A)

¹²And further, by these, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh.

New International Version (NIV)