On Daf 51-52 we find the issue of "Amah Traksin" There was one amah of space designated between the heichal and the kodesh kodoshim. The space was delinieated by a wall/curtain in the first beis hamikdash and in the second Beis Hamikdash it has to be separated by two curtains (or one, depending on a machlokes, but we hold 2). The gemarrah discusses in great detail why the amah had to be separated the way it was, and which side it was similar to for kedusha (the kodesh kodoshim or the heichal), etc.
The thought struck me: Why do we need to know so much detail about this one amah? There was only one person who approached and entered that amah and that was only once a year as it is on yom kippur, and it was only a passage to the room beyond it, so why does it make such a big difference to us that the gemarrah needs to dedicate a whole amud to delineating this amah and discussing its purpose? Mah Nafka Minah?
It is important for us to delineate the amah because we need to know our limits. It does not matter whether or not you will actually get close to those limits or not, but our lives are limited by our limitations and we have to be aware of what those are. For us to function properly, those limits are important.
Psychologists always tell us about children that they misbehave because they are testing the limits and parents who do not delineate a childs borders are negligent as that is the cause of many problems.
We need to know our borders and our limits. It provides for a healthy attitude and a healthy approach to life. Without limits, we are living a life of chaos.