How we cite our quotes: (Chapter:Verse)
Quote #1
I said to myself, "Come now, I will make a test of pleasure; enjoy yourself." But again, this also was vanity. I said of laughter, "It is mad," and of pleasure, "What use is it?" I searched with my mind how to cheer my body with wine—my mind still guiding me with wisdom—and how to lay hold on folly, until I might see what was good for mortals to do under heaven during the few days of their life. (NRSV 2:1-3)
I said in mine heart, Go to now, I will prove thee with mirth, therefore enjoy pleasure: and, behold, this also is vanity. I said of laughter, It is mad: and of mirth, What doeth it? I sought in mine heart to give myself unto wine, yet acquainting mine heart with wisdom; and to lay hold on folly, till I might see what was that good for the sons of men, which they should do under the heaven all the days of their life. (KJV 2:1-3)
Here, the Teacher investigates pleasure and folly and then finds out that they're madness (sheer madness we tell you!). But it's a necessary part of his attempt to discover what wisdom is and what's good for human beings.
Quote #2
So I turned to consider wisdom and madness and folly; for what can the one do who comes after the king? Only what has already been done. Then I saw that wisdom excels folly as light excels darkness. The wise have eyes in their head, but fools walk in darkness. Yet I perceived that the same fate befalls all of them. Then I said to myself, "What happens to the fool will happen to me also; why then have I been so very wise?" And I said to myself that this also is vanity. For there is no enduring remembrance of the wise or of fools, seeing that in the days to come all will have been long forgotten. How can the wise die just like fools? So I hated life, because what is done under the sun was grievous to me; for all is vanity and a chasing after wind. (NRSV 2:12-17)
And I turned myself to behold wisdom, and madness, and folly: for what can the man do that cometh after the king? even that which hath been already done. Then I saw that wisdom excelleth folly, as far as light excelleth darkness. The wise man's eyes are in his head; but the fool walketh in darkness: and I myself perceived also that one event happeneth to them all. 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. For there is no remembrance of the wise more than of the fool for ever; seeing that which now is in the days to come shall all be forgotten. And how dieth the wise man? as the fool. 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. (KJV 2:12-17)
Now, Ecclesiastes starts bashing folly. He was interested in it at first, but now he's saying that wisdom excels folly, because it helps you see what life really is. Yet, then he goes on to say that, "in the long run, we're all dead" (to quote John Maynard Keynes, a famous economist)—the fools and the wise men together.
Quote #3
Then I saw that all toil and all skill in work come from one person's envy of another. This also is vanity and a chasing after wind. Fools fold their hands and consume their own flesh. Better is a handful with quiet than two handfuls with toil, and a chasing after wind. (NRSV 4:4-6)
Again, I considered all travail, and every right work, that for this a man is envied of his neighbour. This is also vanity and vexation of spirit. The fool foldeth his hands together, and eateth his own flesh. Better is an handful with quietness, than both the hands full with travail and vexation of spirit. (KJV 4:4-6)
It's bad to work only to try to beat other people out of envy. Real creative stuff can't come out of this. You need to have passion for the work itself. But it's even worse to just be idle—another fool gnawing on his own flesh (metaphorically—we hope).