Doctors

"I took his heart in my hand and began compressing it - one-two-three-squeeze,one-two-three-squeeze -to keep his blood flow going to his brain" **

I think Doctors, Surgeons in particular is one of those professions that could make a man feel extremely powerful and arrogant or meek.

Just imagine holding a heart in the hand (literally) and squeezing it to give back its life. Every time when a life is saved from a similar improbable situation, it could make them feel like a creator. But on the contrary, when a life is lost right in front of their eyes, in their hands, where their knowledge and expertise are mere spectators, they could become the most humblest, realizing how Death makes one null instantly.

** - Excerpt from "The Checklist Manifesto" by Atul Gawande