Tyrrell and Anna have stated my views better than I'd previously gone so far as verbalizing.
There are large sectors of the mind in which belief tends to become reality, including important things like "I am the sort of person who continues even in the face of adversity" and "I do have the willpower to pass up that cookie."
But - given that you aren't actually trying to fool yourself - there's a chicken-and-egg aspect that depends on your having enough potential in this area that you can legitimately believe the statement will become true if you believe it. At that point, you can believe it and then it will be true.
There's an interesting analogy here to Lob's Theorem which I haven't yet categorized as legitimate or fake.
To look at it another way, this sort of thing is useful for taking simultaneous steps of self-confidence and actual capability in cases where the two move in lockstep. Or, in the case of anti-competencies like doublethink, the reverse.
"I have the potential to be the sort of person who continues even in the face of adversity", or "it is more in my interests to pass up that cookie", or "I really do have a choice whether or not to pass up that cookie". That is what I would recommend.
bill, below, has mentioned "Act as if": "I choose to Act as If I can continue even in the face of adversity, and I intend in this precise moment to continue acting, even if I may just fall down again in two minutes' time".
These have the advantages of being mor...
I don't mean to seem like I'm picking on Kurige, but I think you have to expect a certain amount of questioning if you show up on Less Wrong and say:
"If you know it's double-think...
...how can you still believe it?" I helplessly want to say.
Or:
If you know your belief isn't correlated to reality, how can you still believe it?
Shouldn't the gut-level realization, "Oh, wait, the sky really isn't green" follow from the realization "My map that says 'the sky is green' has no reason to be correlated with the territory"?
Well... apparently not.
One part of this puzzle may be my explanation of Moore's Paradox ("It's raining, but I don't believe it is")—that people introspectively mistake positive affect attached to a quoted belief, for actual credulity.
But another part of it may just be that—contrary to the indignation I initially wanted to put forward—it's actually quite easy not to make the jump from "The map that reflects the territory would say 'X'" to actually believing "X". It takes some work to explain the ideas of minds as map-territory correspondence builders, and even then, it may take more work to get the implications on a gut level.
I realize now that when I wrote "You cannot make yourself believe the sky is green by an act of will", I wasn't just a dispassionate reporter of the existing facts. I was also trying to instill a self-fulfilling prophecy.
It may be wise to go around deliberately repeating "I can't get away with double-thinking! Deep down, I'll know it's not true! If I know my map has no reason to be correlated with the territory, that means I don't believe it!"
Because that way—if you're ever tempted to try—the thoughts "But I know this isn't really true!" and "I can't fool myself!" will always rise readily to mind; and that way, you will indeed be less likely to fool yourself successfully. You're more likely to get, on a gut level, that telling yourself X doesn't make X true: and therefore, really truly not-X.
If you keep telling yourself that you can't just deliberately choose to believe the sky is green—then you're less likely to succeed in fooling yourself on one level or another; either in the sense of really believing it, or of falling into Moore's Paradox, belief in belief, or belief in self-deception.
If you keep telling yourself that deep down you'll know—
If you keep telling yourself that you'd just look at your elaborately constructed false map, and just know that it was a false map without any expected correlation to the territory, and therefore, despite all its elaborate construction, you wouldn't be able to invest any credulity in it—
If you keep telling yourself that reflective consistency will take over and make you stop believing on the object level, once you come to the meta-level realization that the map is not reflecting—
Then when push comes to shove—you may, indeed, fail.
When it comes to deliberate self-deception, you must believe in your own inability!
Tell yourself the effort is doomed—and it will be!
Is that the power of positive thinking, or the power of negative thinking? Either way, it seems like a wise precaution.