If everyone has their own point of view, freedom to hold to and espouse these views, and see their reality filtered by these views, how can you dub one "insane"? what is the standard for reality? if words are symbols made up to relate experiences and ideas between humans, then experience is subjective, then how can you generalize experiences and dub one sane or "normal"? where do you think you cross the line from philosophy, spirituality, and contemplation into the realm of insanity? I believe it's where you start putting others life's or safety in danger with your actions due to your ideas held.
Some people obviously are insane. The kinds of people that when you meet them, you're first thought(impression)about them isn't.. hmmmm...are they a philosopher, a free spirit, etc, etc.. ...It's WOW they're a certifiable nut job.
I Think You Cross The Line The Moment You Become A "Hip Forums" Member.... Speaking From My Own Experience.... Cheers Glen.
Society sees this as when you are either a danger to yourself, to others, or when you cannot take care of yourself. That's the standard.
So you can't do it for yourself, someone else has to do it for you, that is cross the line. As long as you question, you're okay.