The two things that seem to work for me most of the time: “will I feel proud / good about myself for doing this?” or, if that fails, “would person X (whose opinion of me is generally important to me) be impressed or disgusted with this behaviour if they knew about it?”. Essentially, “is this behaviour consistent with the kind of person I wish myself and (particular) others to perceive me to be?”.
The two things that seem to work for me most of the time: “will I feel proud / good about myself for doing this?” or, if that fails, “would person X (whose opinion of me is generally important to me) be impressed or disgusted with this behaviour if they knew about it?”. Essentially, “is this behaviour consistent with the kind of person I wish myself and (particular) others to perceive me to be?”.