Here's an argument that I hope doesn't get too simplistic:
One of the strongest influences on your consciousness that you learn as you grow up, is that you learn to believe in your ability to think. You start to believe, unlike a young child, that what you think and say is important, even more important than what you do.
You start to believe that having an opinion, about anything, is so important that you need to be seen as supporting one opinion over another--this process probably starts when you start school and encounter such opinions from other children.
Anyway, you know that opinions and having them isn't really as important as you also have learned to think they are, the latter process being more a coping mechanism, so you "fit in" and can deal with other people. As a child though, you remain in awe to some extent of the ability of grownups to think about things and discuss them, perhaps even to the extent of feeling some jealousy towards this ability they seem to have.
So, the concept you also have of something that transcends all the thinking and discussing, is perhaps a way to reassure yourself that it is all just ideas. You learn that you too, can have ideas--but where do they really come from? You can't help being influenced by those around you, and so neither can you help having ideas that also conform to those social norms you learn about.
This supposed transcendent "other" gives you a way to suspend your belief, to question if you are really thinking the way you should, or if thinking in and of itself is really the whole point. Otherwise, all you learn about is how to conform and eventually, perhaps you stop questioning. You end up doing what you perceive most of the grownups doing--you accept it all and join in, and then you lose this innate ability to question the role of your thinking mind, and it "becomes" what you think you are.
So by then, you are that which you think you are, and not a being who can exist without those necessary thoughts supporting this existential model you have formed, by "fitting in", by coping and by not wanting to be perceived as an outsider. Thus you lose a certain ability, and instead believe it isn't needed, or even desirable to question the "norm".
And I hope you are having the time of your life,
But think twice,
That's my strong advice.
Who do you, who do you, who do you
Who do you think you are?
Ha ha ha, bless your soul,
Do you really think you're in control?
--Gnarls Barkley