This is the last of my efforts to elucidate how and why we fail at solving Kryptos. I mean really, any more than 5 and I’d be nitpicking.
I would say this is the most important piece.
It’s certainly the simplest.
nosce te ipsum
Know thyself
It’s not as easy as you’d think and is perhaps the hardest to grasp conceptually. I will say that the more time and effort you put into it, the more you’ll understand why I’ve suggested it and why I’ve listed it as means to avoid failure.
Consider it a challenge then…
After the pen has left the paper, the faculties of logic and analysis must begin in earnest.
Good luck.
Kryptos - Beyond K4 
You need a page about how the reason we fail at Kryptos is Sanborn.
That’s exactly what he wants. Chaos. The problem is that he knows us better than we know ourselves.
Consider how hard it is to change yourself and you’ll understand what little chance you have in trying to change others.