Ecclesiastes 2:15

Then thought I in my mind, "If it happeneth unto the fool as it doth unto me, what needeth me then to labour any more for wisdom?" So I confessed within my heart, that this also was but vanity.

Ecclesiastes 6:8

For what hath the wise more than the fool? What helpeth it the poor, that he knoweth to walk before the living?

1 Kings 3:12

see, I have done according to thy petition. And behold, I have given thee a wise and an understanding heart, so that there was none like thee before, neither after thee shall any arise like unto thee.

Ecclesiastes 1:2

All is but vanity - sayeth the Preacher - all is but plain vanity.

Ecclesiastes 1:14

Thus I have considered all the things that come to pass under the Sun, and lo, they are all but vanity and vexation of mind.

Ecclesiastes 1:16

I communed with mine own heart, saying, "Lo, I am come to a 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 1:18-1

For where much wisdom is, there is also great travail and disquietness; and the more knowledge a man hath, the more is his care.

Ecclesiastes 2:16

For the wise are ever as little in remembrance as the foolish, and all the days for to come shall be forgotten, yea the wise man dieth as well as the fool.

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

And why

Ecclesiastes 1:16
I communed with mine own heart, saying, "Lo, I am come to a 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,
1 Kings 3:12
see, I have done according to thy petition. And behold, I have given thee a wise and an understanding heart, so that there was none like thee before, neither after thee shall any arise like unto thee.

Then i

Ecclesiastes 2:1
Then said I thus in my heart, "Now go to, I will take mine ease and have good days." But lo, that was vanity also:
Ecclesiastes 1:2
All is but vanity - sayeth the Preacher - all is but plain vanity.

General references

Ecclesiastes 1:2
All is but vanity - sayeth the Preacher - all is but plain vanity.