Asceticism acknowledges the world’s corrupting power: it takes seriously the danger of contamination and is thus animated more by fear than by contempt.
Jonas argues that Gnostic asceticism and libertinism are twin expressions of a single acosmism, but distinguishes them psychologically: asceticism responds to the world through fearful avoidance while libertinism responds through contemptuous excess.
, The Gnostic Religion: The Message of the Alien God and the Beginnings of Christianity, 1958thesis