For indeed, it is possible to attain a state of divine mansuetude that nothing dismays and nothing surprises, just as one in love might, after many years, arrive at a sublime tranquillity of the sentiments, sure of their force and durability, through constant experience of their pleasures and pains.
-- Honoré de Balzac, Jordan Stump, Adam Gopnik, The Wrong Side of Paris
You are safe, dear old man, you are safe, temporarily, in the mansuetude of our care, Julie said.
-- Donald Barthelme, Donald Antrim, The dead father
Mansuetude derives from the Latin mansuescere, literally "to tame by the hand."