I applied mine heart

Ecclesiastes 1:13-17
And I set my mind to seek and explore by wisdom all that is done under heaven. What a heavy burden God has laid on the sons of men, to keep them occupied! . . .

Ecclesiastes 2:1-3, 12, 20
I said to myself, "Come now, I will test you with pleasure; enjoy what is good!" But it proved to be futile. . . .

the reason

Ecclesiastes 7:27
"Behold, " says the Teacher, "I have discovered this by adding one thing to another to find an explanation.

Ecclesiastes 2:15
So I said to myself, "The fate of the fool will also befall me. What then have I gained by being wise?" And I said to myself that this too is futile.

Ecclesiastes 3:16, 17
Furthermore, I saw under the sun that in the place of judgment there is wickedness, and in the place of righteousness there is wickedness. . . .

Ecclesiastes 9:1, 2
So I took all this to heart and concluded that the righteous and the wise, as well as their deeds, are in God's hands. Man does not know what lies ahead, whether love or hate. . . .

Jeremiah 12:1, 2
Righteous are You, O LORD, when I plead before You. Yet I wish to contend with You: Why does the way of the wicked prosper? Why do all the faithless live at ease? . . .

2 Peter 2:3-9
In their greed, these false teachers will exploit you with tales they have concocted. The longstanding verdict against them remains in force, and their destruction does not sleep. . . .

2 Peter 3:3-9
First of all, you must understand that in the last days scoffers will come, scoffing and following their own evil desires. . . .

know

Ecclesiastes 9:3
This is an evil in everything that is done under the sun: There is one fate for everyone. Furthermore, the hearts of men are full of evil and madness while they are alive, and afterward they join the dead.

Ecclesiastes 10:13
The beginning of his talk is folly, and the end of his speech is evil madness.

Genesis 34:7
When Jacob's sons heard what had happened, they returned from the field. They were filled with grief and fury, because Shechem had committed an outrage in Israel by lying with Jacob's daughter--a thing that should not be done.

Joshua 7:13
Get up and consecrate the people, saying, 'Consecrate yourselves for tomorrow, for this is what the LORD, the God of Israel, says: That which is devoted is among you, O Israel. You cannot stand against your enemies until you remove it.

2 Samuel 13:12
"No, my brother!" she cried. "Do not humiliate me, for such a thing should never be done in Israel. Do not do this disgraceful thing!

Proverbs 17:12
It is better to meet a bear robbed of her cubs than a fool in his folly.

Proverbs 26:11
As a dog returns to its vomit, so a fool repeats his folly.