What Is Questioning Doubt

All unresolved questions can serve as questioning doubt; the only differences lie in their depth and whether they can be sustained. There is also the matter of where the doubt is lodged. If the doubt arises merely in the mind consciousness, it is very shallow—it can be forgotten in a moment and will not be pursued to the end; it is almost always intermittent, and it is very difficult to truly resolve the problem. Only when doubt arises from the manas deep within the mind can one pursue it morning and evening, ceaselessly investigating, doubting that question whether walking, standing, sitting, or lying down, with the thought unbroken, until the question is resolved.