Ecclesiastes 3:16; Ecclesiastes 4:13; Ecclesiastes 7:28; Ecclesiastes 9:5-6; Ecclesiastes 12:9

16 Furthermore, I have seen under the sun that in the place of justice there is wickedness and in the place of righteousness there is wickedness.
13 A poor yet wise lad is better than an old and foolish king who no longer knows how to receive instruction.
28 which I am still seeking but have not found. I have found one man among a thousand, but I have not found a woman among all these.
5 For the living know they will die; but the dead do not know anything, nor have they any longer a reward, for their memory is forgotten. 6 Indeed their love, their hate and their zeal have already perished, and they will no longer have a share in all that is done under the sun.
9 In addition to being a wise man, the Preacher also taught the people knowledge; and he pondered, searched out and arranged many proverbs.