Another one from Zee: (I may adopt this one as my answer to the question “What is quantum field theory”)

Quantum field theory arose our of our need to describe the ephemeral nature of life.

He then goes on to discuss how it takes quantum field theory to explain why fundamental particles pop in and out of existence and shift from one to the other constantly then concludes:

So, I was more or less right: Quantum field theory is a response to the ephemeral nature of life.