This Conversation helps us become aware  that we need boundaries  in order to have control over our life.  When we BECOME  the filter instead of having a filter, we have  the option to determine what or who  will flow in and out of our life,  and we can decide  what portion will remain or get thrown away.  It stops the unwanted from getting in where you  want purity,  or allows the bad elements  to flow out so you  can keep the better part.