The Varieties of Religious Experience: A Study in Human Nature by William James

2. _Noetic quality._—Although so similar to states of feeling, mystical

states seem to those who experience them to be also states of knowledge. They are states of insight into depths of truth unplumbed by the discursive intellect. They are illuminations, revelations, full of significance and importance, all inarticulate though they remain; and as a rule they carry with them a curious sense of authority for after‐time. These two characters will entitle any state to be called mystical, in the sense in which I use the word. Two other qualities are less sharply marked, but are usually found. These are:—