I noticed, while healing myself out of boredom in Org while waiting for my queue, that Blessed Resilience is proccing without taking any damage. I've randomly gotten it while healing myself.
Try it out yourself! Get into Serenity Chakra, throw a Renew on yourself, and keep using Heal. (It procs from any heal but this is the way to do it for a long time) You'll notice it proc a lot and it can even be sustained sometimes.