What is "mysticism", apart from taking pleasure in that which is unknown? 

It is simultaneously the rationalization and the ritualization of uncertainty; the conversion of fear into comfort through the substitution of an ordered but necessarily emprically unfaithful cosmology for the chaotic, yet intricately structured, world we actually find ourselves living in.

And yet it is not the only philosophical system that derives pleasure from the obscure, the hidden or the unknowable. Skepticism in its own way also delights in the unknown, but seldom goes on to subsequently erect an ordered ontologocial edifice or pattern of belief in the absence of persuasive tangible evidence... or even in the presence of the same.