"By & large, Kaccayana, this world is supported by (takes as its object) a polarity, that of existence(convention) & non-existence. But when one sees the origination of the world as it actually is with right discernment, 'non-existence' with reference to the world does not occur to one. When one sees the cessation of the world as it actually is with right discernment, 'existence' with reference to the world does not occur to one.
"'Everything exists': That is one extreme. 'Everything doesn't exist': That is a second extreme. Avoiding these two extremes, the Tathagata teaches the Dhamma via the middle: From ignorance as a requisite condition come fabrications.
http://www.accesstoinsight.org/tipitaka ... .than.html
All the things in the world are suppositions that we've supposed into being. Once we've supposed them, we fall for our own supposings, so nobody lets them go. They turn into views and pride, into attachment. This attachment is something that never ends. It's an affair of samsara that flows without respite, with no way of coming to closure. But if we really know our suppositions, we'll know release. If we really know release, we'll know our suppositions. That's when you know the Dhamma that can come to closure.
http://www.accesstoinsight.org/lib/thai ... _sure.html