Mystics more often than not avoid direct reference to themselves. - Walter Terence Stace

Thus we see that mysticism naturally, though not necessarily, becomes intimately associated with whatever is the religion of the culture in which it appears.

And in the end it is because of mysticism that it is possible to say that “no man is an island” and that on the contrary every man is “a part of the main.”

It is certainly the case that there can exist an atheistic mysticism, a mystical experience naked and not clothed in any religious garb.