Correct me if I'm wrong: I'm asserting that having a principle is an inalienable belief that actually guides behavior, not selectively applies to behavior.
Though generally: yes, I agree: get off twitter, and I'd go a step further and say..minimize all social media involvement.
I don't mean that in a fully negative way, since belief and choices are rarely atomic.
Take, for example, someone who believes animals shouldn't suffer unnecessarily. That can manifest anywhere from veganism to just avoiding factory farmed meat. I wouldn't point at any one position on that spectrum and say they don't believe their own stated principle, but I would say that some have weaker convictions than others.
I agree with your assertion regarding the degree to which a principle guides behavior. And id probably walk back my original position somewhat, because having a principle and adhering to it absolutely and fanatically is untenable at most and inconvenient at least.
Still, I'd argue there's value in a human engaging in some sort of periodic "principles audit" to take stock of their past behaviors/actions and recalibrate future behavior.
Then again, I'm an optimist....
I do agree with this. I would call it "introspection" and a healthy person should be fairly introspective in general, either taking dedicated time to consider their actions and beliefs, or continually keeping them in mind when making decisions.