That which is crooked cannot be made straight: and that which is wanting cannot be numbered.(Ecclesiastes 1:15)

I communed with mine own heart, saying, Lo, I am come to great estate, and have gotten more wisdom than all they that have been before me in Jerusalem: yea, my heart had great experience of wisdom and knowledge.(Ecclesiastes 1:16)

And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.(Ecclesiastes 1:17)

For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow.

I said in mine heart, Go to now, I will prove thee with mirth, therefore enjoy pleasure: and, behold, this also is vanity.(Ecclesiastes 2:1)

I said of laughter, It is mad: and of mirth, What doeth it?(Ecclesiastes 2:2)

I sought in mine heart to give myself unto wine, yet acquainting mine heart with wisdom; and to lay hold on folly, till I might see what was that good for the sons of men, which they should do under the heaven all the days of their life.(Ecclesiastes 2:3)

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Ecclesiastes 1:18 - Cross Reference

Let no man deceive himself. If any man among you seemeth to be wise in this world, let him become a fool, that he may be wise. (1 Corinthians 3:18)

Then said I in my heart, As it happeneth to the fool, so it happeneth even to me; and why was I then more wise? Then I said in my heart, that this also is vanity. (Ecclesiastes 2:15)

Be not righteous over much; neither make thyself over wise: why shouldest thou destroy thyself ? (Ecclesiastes 7:16)

Who is a wise man and endued with knowledge among you? let him shew out of a good conversation his works with meekness of wisdom. (James 3:13)

For all his days are sorrows, and his travail grief; yea, his heart taketh not rest in the night. This is also vanity. (Ecclesiastes 2:23)

And unto man he said, Behold, the fear of the LORD, that is wisdom; and to depart from evil is understanding. (Job 28:28)

And further, by these, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh. (Ecclesiastes 12:12)