I was acting on 'pure' intuition/instinct. [=only because of intuition/instinct and not for any other reason]
Don't expect me to believe you're '(as) pure as the driven snow'. [=morally perfect]
The relationship is over, 'pure and simple'. [=the relationship is completely over]
(..) For Sharon. Mommy. Mommy. Mommy. Mommy! Oh, Lord, give me the strength to stay pure. No! No! Alessa, what have you become? Mommy! Sharon! Sharon, honey, it's me. It's Mommy. (..)2006 Silent Hill