If you have a philosophical bent, you can get yourself in a quandary where you realize that every decision you have to make is actually very to hard to make - there are so many factors and possibilities that it can start to overwhelm the mind. In the blogger's example, when asked what he wants for lunch, he has to assume he knows how different dishes taste - even ones which he may not have tried. Also, he has to consider not only what sounds good now, but what's going to sound good in 5 minutes, and also later today when he is exercising, and so on. The reality is, it's impossible to know what the best answer is to the question, "what do you want for lunch?"
So, then, how do you chose? If you don't want to always go hungry, how do you pick what you eat? At some point, you have to admit that you don't know what's best, and go with your best guess. Make a tiny leap-of-faith (an "order of faith"?). But, an honest, intelligent person will also admit that, however that order turns out, they don't know if it was the best option - there are always roads untaken.
It's not a fun way to go through life; it can be quite frustrating. Absolute surety is much more comfortable and easy:
There's an obvious religious parallel here. Not to put too fine a point on it, but surety is nice. It's much easier to be religious (or anything, I suppose) when we're sure that we're doing the right thing. But, if I really think about it, if I can't even say, with 100% confidence, what the "right" lunch is for me, how can I be 100% sure that my God is real, or that my religion is "right", or that my denomination is best? I can't. And that is precisely the difference between me (and, hopefully, you) and a fanatic - the understanding that we never know. We're never sure.
What I would like to be able to say is, “I want the falafel.” Very definitively, with a sense of authority and calm.
“Are you sure?”
“Yes. I want the falafel. I swear: I want the falafel.”
I imagine this type of certainty is accompanied by an incredible sense of relief. The endless permutations of This Moment are reduced to one, clear path. All that remains is to take the necessary steps in the right direction. The horrifying image of an infinite number of compasses pointing North in an infinite number of different directions—with a blink, it disappears. North is North. “I swear.” (See, for example, Charlie Chaplin’s paper compass in ‘The Gold Rush’.)
But we are far too limited to attain such certainty. I can do my best but I will never really know what I should have for lunch.
Like with lunch, in matters of faith we must sooner or later place our order, or we're going to be very hungry, and hold up the line (ok, the metaphor might break down, a little). But, that doesn't mean that our order is best. It's just ours. Remembering that we're not sure, not 100%, about that order is an important step, maybe the most important step, in accepting others who have different tastes than we do.