And if that ye in clene love me gye,
He wol yow loven as me, for youre clennesse,
And shewen yow his joye and his brightnesse.
– Geoffrey Chaucer
The Canterbury Tales, The Second Nun’s Tale. On the night that Cecilia’s husband Valerian is to bed her, she tells him that if he loves her chastely, her guardian angel who is protecting her virginity will love him for his chastity and show him his joy and brightness.