FAUSTUS. Come, I think hell’s a fable.

MEPHISTOPHILES: Ay, think so still, till experience change thy mind.

Christopher "Kit" Marlowe (1564-1593) English dramatist and poet

The Tragicall History of the Life and Death of Doctor Faustus, Act 2, sc. 1 (sc. 5), l. 573ff (1594; 1604 “A” text)
    (Source)

The "B" text (1594; 1616) as a slight variance in Faust's line:

FAUSTUS: I think hell's a mere fable.
MEPHISTOPHILES: Aye, think so still, till experience change thy mind.