Cross reference
Ecclesiastes 7:27
27 See, this I have found, said the Preacher, one to one, to find out the reason
Ecclesiastes 1:1-2
1 Words of a preacher, son of David, king in Jerusalem:
2 Vanity of vanities, said the Preacher, Vanity of vanities: the whole `is' vanity.
Ecclesiastes 12:8-10
8 Vanity of vanities, said the preacher, the whole `is' vanity.
9 And further, because the preacher was wise, he still taught the people knowledge, and gave ear, and sought out -- he made right many similes.
10 The preacher sought to find out pleasing words, and, written `by' the upright, words of truth.