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JulianMorrison comments on The ideas you're not ready to post - Less Wrong
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The Reflection Principle, held by some epistemologists to be a constraint on rationality, holds that if you learn that you will believe some proposition P in the future, you should believe P now. There is complicated math about what you should do if you have degree of credence X in the proposition that you will have credence Y in proposition P in the future and how that should affect your current probability for P, but that's the basic idea. An alternate formulation is that you should treat your future self as a general expert.
Well that's pretty silly. You wouldn't treat your present self as a general expert.
Wouldn't you? You believe everything you believe. If you didn't consider yourself a general expert, why wouldn't you just follow around somebody clever and agree with them whenever they asserted something? And even then, you'd be trusting your expertise on who was clever.
"It's raining outside but I don't believe that it is."