Ecclesiastes 7:21-25

²¹But also give thou not thine heart to all words, that be said; lest peradventure thou hear thy servant cursing thee;

²²for thy conscience knoweth, that also thou hast cursed oft other men.

²³I assayed all things in wisdom; I said, I shall be made wise, and it went away further from me,

²⁴much more than it was; and the depth is low, who shall find it?

²⁵I compassed all things with my soul, to know, and to behold, and seek wisdom, and reason, and to know the wickedness of a fool, and the error of unprudent men.