Ecclesiastes 1:13; Ecclesiastes 1:16-18

13 And I have given my heart to seek and to search out by wisdom concerning all that hath been done under the heavens. It [is] a sad travail God hath given to the sons of man to be humbled by it.

16 I -- I spake with my heart, saying, `I, lo, I have magnified and added wisdom above every one who hath been before me at Jerusalem, and my heart hath seen abundantly wisdom and knowledge.

17 And I give my heart to know wisdom, and to know madness and folly: I have known that even this [is] vexation of spirit;

18 for, in abundance of wisdom [is] abundance of sadness, and he who addeth knowledge addeth pain.'