‘Why has sex become man’s chief stumbling block?’ But has it? Or is it only the most recognisable of the stumbling blocks? I mean, we can mistake pride for a good conscience, and cruelty for zeal, and idleness for the peace of God et cetera. But when lust is upon us, then, owing to the obvious physical symptoms, we can’t pretend it is anything else. Is it perhaps only the least disguisable of our dangers.

C. S. Lewis (1898-1963) English writer, literary scholar, lay theologian [Clive Staples Lewis]

Letter (27 Sep 1954)