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Eliezer_Yudkowsky comments on What is Bayesianism? - Less Wrong
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Traditional Rationality is often expressed as social rules, under which this claim might work. But in Bayesian Rationality, there is math that tells you exactly what you ought to believe given the evidence you have observed.
See No One Can Exempt You From Rationality's Laws.
Okay -- but in practicality, what if I don't have time (or mental focus, or whatever resources it takes) to explicitly identify, enumerate, and evaluate each piece of evidence that I may be considering? It took me over an hour just to get this far with a Bayesian analysis of one hypothesis, which I'm probably not even doing right.
Or do we step outside the realm of Bayesian Rationality when we look at practical considerations like "finite computing resources"?
I'd actually say, start with the prior and with the strongest piece of evidence you think you have. This of itself should reveal something interesting and disputable.