Reinforcing that "mysticism" is not a New Testament teaching...
The Christian mystic like the Zen Buddhist doesn't rely on others to tell him what to think. The Church Christian on the other hand, like the Buddhist does rely on others to tell him what to think.
You'd have to agree then that, since New Testament Christians found the writings of Paul, Peter, James, John and others to be important and relied on them for clarity of understanding, these Christians were far from being mystics.
Steve.