On Doctor Who Season 11 Episode 11, the New Year's Day Special, custodians of the remains of a dangerous enemy from a battle in the 9th Century bury the pieces they're entrusted with in remote and distant places.
Only in darkness are we revealed. [...] Goodness is not goodness that seeks advantage. Good is good in the final hour, in the deepest pit, without hope, without witness, without reward. Virtue is only virtue in extremis. This is what *he* believes, and this is the reason above all I love him, my husband. My madman in a box. My Doctor.