"...and they sang and danced together gayly/"
The best picture of "Yes" I can think of is each brick that the third little pig used to build his house that was safe and strong against the huffing and puffing of the big bad wolf. The other two pigs laughed at him and called him names, but he held his ground and built his house that saved him and the others from teeth that eat little pigs every day.
Each of us builds our house with "yes's". We see what our house looks like when we look in the mirror, when others look at us, when the storm comes, etc. A half-blind man standing on the moon with a bad pair of binoculars can see a good, strong house. Our house tells us - and the rest of the universe - who we are, what we stand for, what is important to us and what is not.
The third little pig builds his house on purpose, being careful about what he says 'yes' to and by implication what he says 'no' to as well. Not everyone who knows him likes him or respects his efforts. But everybody who knows him knows what he stands for, what he believes in, who he is and what he values. His house is a place of healing, growth and protection for those who connect with him. His character and self expression are substantial, meaningful and effectual.
This is fundamentally different from the first little pig who lives in the Abyss and says 'yes' all the time. But his yes doesn't mean anything. "Yes", "No", "It Doesn't Matter" and "I Don't Care" all mean virtually the same thing - absolutely nothing. "Yes" today is liable to be "No" tomorrow, and the first little pig doesn't even know that he changed his answer. He has no clue that he is building his house, or that a house has any real value anyway. His character and self expression are meaningless.
The second little pig uses "Yes" as a tool to an end. His 'yes' is only a way to manipulate others into doing what he wants them to do or making them give him something. He says 'yes' but only as long as it gives him pleasure or causes others to serve him. When he's finished with them, he discards them (and his "yes's") altogether. He too knows not that he is building his house. He thinks himself clever, and the center of his universe. His character and self expression are mean, selfish and destructive.
Human beings have the responsibility and freedom of choice. Choices come from values. Values come from character. Character comes from choices. I know, it's a circle. Over time, the circle takes on the attributes of a boulder bouncing down the mountainside. There's a certain inevitability to it as momentum builds and life goes faster.
This is exactly why we need to find and become intimately acquainted with that which is universally Right, Pure, True and Good, and that we learn to align our "Yes" with it. This is where the worldview discussion kicks in. It's the only way we're ever going to know how to build our houses. Life will judge us, and in the end everyone will know whether we did well.
Or we can play in the straw and tell ourselves that the big bad wolf is only a fairy tale. After all, that which we ignore does not exist, right? But Wisdom would suggest that we find the third little pig, and at least stay in his good graces - just in case.