Sathan, that evere us waiteth to bigile,
Saugh of Custance al hire perfeccioun,
And caste anon how he myghte quite hir while.

– Geoffrey Chaucer

The Canterbury Tales, The Man of Law’s Tale. The battle between good and evil never relents. Satan, observing how virtous and perfect Constance is, plots to bring about her fall. As she grows into the ultimate follower of Christ, he considers how he might trick her and pay her back for her goodness.