Jargon, not argument.

Screwtape to Wormwood:

Your man has been accustomed, ever since he was a boy, to having a dozen incompatible philosophies dancing about together inside his head. He doesn’t think of doctrines as primarily “true” or “false,” but as “academic” or “practical,” “outworn” or “contemporary,” “conventional” or “ruthless.” Jargon, not argument, is your best ally in keeping him from the Church.  …  The trouble about argument is that it moves the whole struggle onto the Enemy’s own ground.

(C.S. Lewis, The Screwtape Letters, p. 1, HarperCollins, 1942, 2001.)