Mysticism is detached observation of what is.
Thinking is active manipulation of what might be, into what it almost certainly isn't.
You may be mystical, or you may be thinking, but you may not be (doing) both, at the same time.
Why would you want to be mystical?
So that you may know the truth without making it untrue by inserting yourself into it.
Why would you want to think?
So that you might avoid the possible consequences of truth by making it more comfortable to you.
Thinking could be seen as a last resort.
The lengths to which one might go when one is unable to deal with what is.
Thinking is fantasy made 'real'.
Mysticism could be seen as stark courage.
The ability to face, head-on, an often terrifying reality.
Can you deal with it, as-is? Or must you make it sugary-sweet, first?