Albert Barnes Commentary Ecclesiastes 1:8

"All things are full of weariness; man cannot utter [it]: the eye is not satisfied with seeing, nor the ear filled with hearing." — Ecclesiastes 1:8 (ASV)

All things ... utter it - This clause, as here translated, refers to the immensity of labor. Others translate it, all words are full of labor; they make weary the hearers, or are feeble or insufficient to tell the whole; and are referred to the impossibility of adequately describing labor.