" She [Haniya Daoud] seemed tired, but also calm. 'It's good to be reminded now and then that such things exist.'

'What things?'

'Beauty. Peace.' She held his eyes. 'Goodness. But they're fragile and can so easily disappear, unless people are willing to do what's necessary to defend them.'

'I'm not sure that goodness is all that fragile,' said Gamache.

...'If not fragile, it's mercurial,' said Haniya. 'Good. Evil. Cruelty and kindness. Guilt and innocence. An act cam be all those things at once, depending on your perspective. It's so easy to delude ourselves, wouldn't you say, Chief Inspector?'

'Into believing killing one person to save millions is an act of moral courage?'

'I don't think that's a delusion.'

'And if you kill the wrong person? "

― Louise Penny , The Madness of Crowds (Chief Inspector Armand Gamache, #17)