wedrifid comments on Rationality quotes January 2012 - Less Wrong
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"Proving useful in your life" (but not necessarily "proving beneficial") is the core of instrumental rationality, but what's useful is not necessarily what's true, so it's important to refrain from using that metric in epistemic rationality.
Example: cognitive behavioral therapy is often useful "to solve problems concerning dysfunctional emotions", but not useful for pursuing truth. There's also mindfulness-based cognitive therapy for an example more relevant to Buddhism.
It is useful for pursuing truth to the extent that it can correct actually false beliefs when they happen to tend in one direction.
This sometimes comes at the expense of other truths, just as pursuing evidence for your preferred conclusion turns up real evidence but a less accurate map.