Ecclesiastes 7:25

I have turned round, also my heart, to know and to search, and to seek out wisdom, and reason, and to know the wrong of folly, and of foolishness the madness.

Ecclesiastes 10:13

The beginning of the words of his mouth is folly, And the latter end of his mouth Is mischievous madness.

Genesis 34:7

and the sons of Jacob came in from the field when they heard, and the men grieve themselves, and it is very displeasing to them, for folly he hath done against Israel, to lie with the daughter of Jacob -- and so it is not done.

Joshua 7:13

Rise, sanctify the people, and thou hast said, Sanctify yourselves for to-morrow; for thus said Jehovah, God of Israel, A devoted thing is in thy midst, O Israel, thou art not able to stand before thine enemies till your turning aside of the devoted thing out of your midst;

2 Samuel 13:12

And she saith to him, 'Nay, my brother, do not humble me, for it is not done so in Israel; do not this folly.

Proverbs 17:12

The meeting of a bereaved bear by a man, And -- not a fool in his folly.

Proverbs 26:11

As a dog hath returned to its vomit, A fool is repeating his folly.

Ecclesiastes 1:13-17

And I have given my heart to seek and to search out by wisdom concerning all that hath been done under the heavens. It is a sad travail God hath given to the sons of man to be humbled by it.

Ecclesiastes 2:1-3

I said in my heart, 'Pray, come, I try thee with mirth, and look thou on gladness;' and lo, even it is vanity.

Ecclesiastes 2:12

And I turned to see wisdom, and madness, and folly, but what is the man who cometh after the king? that which is already -- they have done it!

Ecclesiastes 2:15

and I said in my heart, 'As it happeneth with the fool, it happeneth also with me, and why am I then more wise?' And I spake in my heart, that also this is vanity:

Ecclesiastes 2:20

And I turned round to cause my heart to despair concerning all the labour that I laboured at under the sun.

Ecclesiastes 3:16-17

And again, I have seen under the sun the place of judgment -- there is the wicked; and the place of righteousness -- there is the wicked.

Ecclesiastes 7:27

See, this I have found, said the Preacher, one to one, to find out the reason

Ecclesiastes 9:1-3

But all this I have laid unto my heart, so as to clear up the whole of this, that the righteous and the wise, and their works, are in the hand of God, neither love nor hatred doth man know, the whole is before them.

Jeremiah 12:1-2

Righteous art Thou, O Jehovah, When I plead towards thee, Only, judgments do I speak with Thee, Wherefore did the way of the wicked prosper? At rest have been all treacherous dealers.

2 Peter 2:3-9

and in covetousness, with moulded words, of you they shall make merchandise, whose judgment of old is not idle, and their destruction doth not slumber.

2 Peter 3:3-9

this first knowing, that there shall come in the latter end of the days scoffers, according to their own desires going on,

Treasury of Scripture Knowledge

Summary

I applied mine heart to know, and to search, and to seek out wisdom, and the reason of things, and to know the wickedness of folly, even of foolishness and madness:

I applied mine heart

General references

Bible References

I applied mine heart

Ecclesiastes 1:13
And I have given my heart to seek and to search out by wisdom concerning all that hath been done under the heavens. It is a sad travail God hath given to the sons of man to be humbled by it.
Ecclesiastes 2:1
I said in my heart, 'Pray, come, I try thee with mirth, and look thou on gladness;' and lo, even it is vanity.

The reason

Ecclesiastes 7:27
See, this I have found, said the Preacher, one to one, to find out the reason
Ecclesiastes 3:16
And again, I have seen under the sun the place of judgment -- there is the wicked; and the place of righteousness -- there is the wicked.
Ecclesiastes 9:1
But all this I have laid unto my heart, so as to clear up the whole of this, that the righteous and the wise, and their works, are in the hand of God, neither love nor hatred doth man know, the whole is before them.
Jeremiah 12:1
Righteous art Thou, O Jehovah, When I plead towards thee, Only, judgments do I speak with Thee, Wherefore did the way of the wicked prosper? At rest have been all treacherous dealers.
2 Peter 2:3
and in covetousness, with moulded words, of you they shall make merchandise, whose judgment of old is not idle, and their destruction doth not slumber.
2 Peter 3:3
this first knowing, that there shall come in the latter end of the days scoffers, according to their own desires going on,

Know

Ecclesiastes 9:3
This is an evil among all that hath been done under the sun, that one event is to all, and also the heart of the sons of man is full of evil, and madness is in their heart during their life, and after it -- unto the dead.
Ecclesiastes 10:13
The beginning of the words of his mouth is folly, And the latter end of his mouth Is mischievous madness.
Genesis 34:7
and the sons of Jacob came in from the field when they heard, and the men grieve themselves, and it is very displeasing to them, for folly he hath done against Israel, to lie with the daughter of Jacob -- and so it is not done.
Joshua 7:13
Rise, sanctify the people, and thou hast said, Sanctify yourselves for to-morrow; for thus said Jehovah, God of Israel, A devoted thing is in thy midst, O Israel, thou art not able to stand before thine enemies till your turning aside of the devoted thing out of your midst;
2 Samuel 13:12
And she saith to him, 'Nay, my brother, do not humble me, for it is not done so in Israel; do not this folly.
Proverbs 17:12
The meeting of a bereaved bear by a man, And -- not a fool in his folly.
Proverbs 26:11
As a dog hath returned to its vomit, A fool is repeating his folly.

General references

Job 28:12
And the wisdom -- whence is it found? And where is this, the place of understanding?