Ecclesiastes 2:23
"For all his days are sorrows, and his travail grief; yea, his heart taketh not rest in the night. This is also vanity."
Cross References (ranked by relevance)
Man that is born of a woman is of few days, and full of trouble.
Yet man is born unto trouble, as the sparks fly upward.
It is vain for you to rise up early, to sit up late, to eat the bread of sorrows: for so he giveth his beloved sleep.
And Jacob said unto Pharaoh, The days of the years of my pilgrimage are an hundred and thirty years: few and evil have the days of the years of my life been, and have not attained unto the days of the years of the life of my fathers in the days of their pilgrimage.
Make us glad according to the days wherein thou hast afflicted us, and the years wherein we have seen evil.
The sleep of a labouring man is sweet, whether he eat little or much: but the abundance of the rich will not suffer him to sleep.
On that night could not the king sleep, and he commanded to bring the book of records of the chronicles; and they were read before the king.
For day and night thy hand was heavy upon me: my moisture is turned into the drought of summer. Selah.
For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow.
Then the king went to his palace, and passed the night fasting: neither were instruments of musick brought before him: and his sleep went from him.
Confirming the souls of the disciples, and exhorting them to continue in the faith, and that we must through much tribulation enter into the kingdom of God.