Who can spot the deliberate error in the title?
You may be a mystic, or you may be a thinker, but you may not be both at the same time.
Mysticism being the absence of thought, and thought being the absence of mysticism.
Something is whatever it is, until you run it through your thought-machine, ending up with whatever you think it is.
One may learn to suspend thought, at will, thus attaining the ability to become mystical.
This does not mean one is unable to think.
Only that one now has the choice of whether to think, or not.
Highly recommended: the ability to not-think, when thinking does not serve.