Mysticism always undermines doctrine because it places experience above objective truth. The usual definition of mysticism is union with God with no intermediaries. The medieval monks had 3 levels to go through to find union with God (see "The Cloud of Unknowing" which I've read). It is esoteric garbage.
Thomas Keating, Thomas Merton and others who have influenced this modern mystical movement believed in meditating with Buddhists and Hindus and thought the Buddhists and Hindus had spiritual insight and wisdom. Keating says the goal is to be with God in the state where subject and object disappear. IOW, there is no distinction between you and God. This is not Christianity - it is an Eastern religious worldview.
Exactly right. I was teaching an Adult Sunday School class when one of the participants (a proponent of SF) exclaimed, "This is not propositional! The gospel is about relationship!"
I replied, "You can't have 'relationship' without knowledge, and the closer you are, the more you know..."
Oy.
I have an article on it here:
http://christiananswersforthenewage.org/Articles_ContemplativePrayer1.html
Excellent articles. Read and heed.