Ecclesiastes 11:8

But even if a man's life is long and he has joy in all his years, let him keep in mind the dark days, because they will be great in number. Whatever may come is to no purpose.

Deuteronomy 32:29

If only they were wise, if only this was clear to them, and they would give thought to their future!

Job 10:22

A land of thick dark, without order, where the very light is dark.

Job 14:10

But man comes to his death and is gone: he gives up his spirit, and where is he?

Job 15:23

He is wandering about in search of bread, saying, Where is it? and he is certain that the day of trouble is ready for him:

Job 18:18

He is sent away from the light into the dark; he is forced out of the world.

Ecclesiastes 2:1-11

I said in my heart, I will give you joy for a test; so take your pleasure--but it was to no purpose.

Ecclesiastes 2:15

Then said I in my heart: As it comes to the foolish man, so will it come to me; so why have I been wise overmuch? Then I said in my heart: This again is to no purpose.

Ecclesiastes 2:17

So I was hating life, because everything under the sun was evil to me: all is to no purpose and desire for wind.

Ecclesiastes 2:19

And who is to say if that man will be wise or foolish? But he will have power over all my work which I have done and in which I have been wise under the sun. This again is to no purpose.

Ecclesiastes 2:21-23

Because there is a man whose work has been done with wisdom, with knowledge, and with an expert hand; but one who has done nothing for it will have it for his heritage. This again is to no purpose and a great evil.

Ecclesiastes 2:26

To the man with whom he is pleased, God gives wisdom and knowledge and joy; but to the sinner he gives the work of getting goods together and storing up wealth, to give to him in whom God has pleasure. This again is to no purpose and desire for wind.

Ecclesiastes 3:12-13

I am certain that there is nothing better for a man than to be glad, and to do good while life is in him.

Ecclesiastes 4:8

It is one who is by himself, without a second, and without son or brother; but there is no end to all his work, and he has never enough of wealth. For whom, then, am I working and keeping myself from pleasure? This again is to no purpose, and a bitter work.

Ecclesiastes 4:16

There was no end of all the people, of all those whose head he was, but they who come later will have no delight in him. This again is to no purpose and desire for wind.

Ecclesiastes 5:15-16

As he came from his mother at birth, so does he go again; he gets from his work no reward which he may take away in his hand.

Ecclesiastes 5:18-20

This is what I have seen: it is good and fair for a man to take meat and drink and to have joy in all his work under the sun, all the days of his life which God has given him; that is his reward.

Ecclesiastes 6:6

And though he goes on living a thousand years twice over and does not see good, are not the two going to the same place?

Ecclesiastes 6:11

There are words without number for increasing what is to no purpose, but what is man profited by them?

Ecclesiastes 7:14

In the day of wealth have joy, but in the day of evil take thought: God has put the one against the other, so that man may not be certain what will be after him.

Ecclesiastes 8:12

Though a sinner does evil a hundred times and his life is long, I am certain that it will be well for those who go in fear of God and are in fear before him.

Ecclesiastes 8:15

So I gave praise to joy, because there is nothing better for a man to do under the sun than to take meat and drink and be happy; for that will be with him in his work all the days of his life which God gives him under the sun.

Ecclesiastes 12:1-5

Let your mind be turned to your Maker in the days of your strength, while the evil days come not, and the years are far away when you will say, I have no pleasure in them;

Jeremiah 13:16

Give glory to the Lord your God, before he makes it dark, and before your feet are slipping on the dark mountains, and, while you are looking for a light, he makes it into deep dark, into black night.

Joel 2:2

For a day of dark and deep shade is near, a day of cloud and black night: like a black cloud a great and strong people is covering the mountains; there has never been any like them and will not be after them again, from generation to generation.

Matthew 22:13

Then the king said to the servants, Put cords round his hands and feet and put him out into the dark; there will be weeping and cries of sorrow.

John 12:35

Jesus said to them, For a little time longer the light will be among you; while you have the light go on walking in it, so that the dark may not overtake you: one walking in the dark has no knowledge of where he is going.

Jude 1:18

How they said to you, In the last days there will be men who, guided by their evil desires, will make sport of holy things.

Treasury of Scripture Knowledge

Summary

But if a man live many years, and rejoice in them all; yet let him remember the days of darkness; for they shall be many. All that cometh is vanity.

General references

Bible References

If a man

Ecclesiastes 6:6
And though he goes on living a thousand years twice over and does not see good, are not the two going to the same place?
Ecclesiastes 8:12
Though a sinner does evil a hundred times and his life is long, I am certain that it will be well for those who go in fear of God and are in fear before him.

Rejoice

Ecclesiastes 3:12
I am certain that there is nothing better for a man than to be glad, and to do good while life is in him.
Ecclesiastes 5:18
This is what I have seen: it is good and fair for a man to take meat and drink and to have joy in all his work under the sun, all the days of his life which God has given him; that is his reward.
Ecclesiastes 8:15
So I gave praise to joy, because there is nothing better for a man to do under the sun than to take meat and drink and be happy; for that will be with him in his work all the days of his life which God gives him under the sun.

Yet

Ecclesiastes 7:14
In the day of wealth have joy, but in the day of evil take thought: God has put the one against the other, so that man may not be certain what will be after him.
Ecclesiastes 12:1
Let your mind be turned to your Maker in the days of your strength, while the evil days come not, and the years are far away when you will say, I have no pleasure in them;
Deuteronomy 32:29
If only they were wise, if only this was clear to them, and they would give thought to their future!
Job 10:22
A land of thick dark, without order, where the very light is dark.
Job 14:10
But man comes to his death and is gone: he gives up his spirit, and where is he?
Job 15:23
He is wandering about in search of bread, saying, Where is it? and he is certain that the day of trouble is ready for him:
Job 18:18
He is sent away from the light into the dark; he is forced out of the world.
Jeremiah 13:16
Give glory to the Lord your God, before he makes it dark, and before your feet are slipping on the dark mountains, and, while you are looking for a light, he makes it into deep dark, into black night.
Joel 2:2
For a day of dark and deep shade is near, a day of cloud and black night: like a black cloud a great and strong people is covering the mountains; there has never been any like them and will not be after them again, from generation to generation.
Matthew 22:13
Then the king said to the servants, Put cords round his hands and feet and put him out into the dark; there will be weeping and cries of sorrow.
John 12:35
Jesus said to them, For a little time longer the light will be among you; while you have the light go on walking in it, so that the dark may not overtake you: one walking in the dark has no knowledge of where he is going.
Jude 1:18
How they said to you, In the last days there will be men who, guided by their evil desires, will make sport of holy things.

All that

Ecclesiastes 2:1
I said in my heart, I will give you joy for a test; so take your pleasure--but it was to no purpose.
Ecclesiastes 4:8
It is one who is by himself, without a second, and without son or brother; but there is no end to all his work, and he has never enough of wealth. For whom, then, am I working and keeping myself from pleasure? This again is to no purpose, and a bitter work.
Ecclesiastes 5:15
As he came from his mother at birth, so does he go again; he gets from his work no reward which he may take away in his hand.
Ecclesiastes 6:11
There are words without number for increasing what is to no purpose, but what is man profited by them?

General references

Ecclesiastes 1:2
All is to no purpose, said the Preacher, all the ways of man are to no purpose.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain