Psalms 77:2 In the day of my trouble I sought the Lord. My hand was stretched out in the night, and didn't get tired. My soul refused to be comforted. (See RSV)
Ecclesiastes 1:8 All these things are wearying; a man is not able to speak, the eye is not satisfied by seeing, nor filled is the ear from hearing. (YLT)
Ecclesiastes 12:12 And furthermore, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh. (See NAS)