Authors:

Some people's affability is more deadly than the violence of coarser souls.

Arthur Conan Doyle (2016). “Sherlock Holmes - The Short Stories (Book 2): The Return of Sherlock Holmes (Part 2), His Last Bow, The Case-Book of Sherlock Holmes”, p.456, BoD - Books on Demand
Some people's affability is more deadly than the violence of coarser souls.