Yea, I hated all my labour which I had taken under the sun: because I should leave it unto the man that shall be after me.(Ecclesiastes 2:18)

And who knoweth whether he shall be a wise man or a fool? yet shall he have rule over all my labour wherein I have laboured, and wherein I have shewed myself wise under the sun. This is also vanity.(Ecclesiastes 2:19)

Therefore I went about to cause my heart to despair of all the labour which I took under the sun.(Ecclesiastes 2:20)

For there is a man whose labour is in wisdom, and in knowledge, and in equity; yet to a man that hath not laboured therein shall he leave it for his portion. This also is vanity and a great evil.

For what hath man of all his labour, and of the vexation of his heart, wherein he hath laboured under the sun?(Ecclesiastes 2:22)

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)

There is nothing better for a man, than that he should eat and drink, and that he should make his soul enjoy good in his labour. This also I saw, that it was from the hand of God.(Ecclesiastes 2:24)

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Ecclesiastes 2:21 - Cross Reference

Wisdom is better than weapons of war: but one sinner destroyeth much good. (Ecclesiastes 9:18)

Therefore I hated life; because the work that is wrought under the sun is grievous unto me: for all is vanity and vexation of spirit. (Ecclesiastes 2:17)

Jehoiakim was twenty and five years old when he began to reign, and he reigned eleven years in Jerusalem: and he did that which was evil in the sight of the LORD his God. (2 Chronicles 36:5)

But thine eyes and thine heart are not but for thy covetousness, and for to shed innocent blood, and for oppression, and for violence, to do it. (Jeremiah 22:17)

And thus did Hezekiah throughout all Judah, and wrought that which was good and right and truth before the LORD his God. (2 Chronicles 31:20)

Shalt thou reign, because thou closest thyself in cedar? did not thy father eat and drink, and do judgment and justice, and then it was well with him? (Jeremiah 22:15)

And he did that which was right in the sight of the LORD, and walked in the ways of David his father, and declined neither to the right hand, nor to the left. (2 Chronicles 34:2)

But did that which was evil in the sight of the LORD, like unto the abominations of the heathen, whom the LORD had cast out before the children of Israel. (2 Chronicles 33:2)

And there was no passover like to that kept in Israel from the days of Samuel the prophet; neither did all the kings of Israel keep such a passover as Josiah kept, and the priests, and the Levites, and all Judah and Israel that were present, and the inhabitants of Jerusalem. (2 Chronicles 35:18)