Ecclesiastes 4:8
There is one alone, and there is not a second; yea, he hath neither child nor brother: yet is there no end of all his labour; neither is his eye satisfied with riches; neither saith he, For whom do I labour, and bereave my soul of good? This is also vanity, yea, it is a sore travail.
Ecclesiastes 7:27
Behold, this have I found, saith the preacher, counting one by one, to find out the account:
Ecclesiastes 10:3
Yea also, when he that is a fool walketh by the way, his wisdom faileth him, and he saith to every one that he is a fool.