Coleman used to start his field theory course saying this
Sidney Coleman
Quote of the day
What we observe is not nature itself but nature exposed to our method of questioning. Our scientific work in physics consists in asking questions about nature in the language that we possess and trying to get an answer from experiment by the means that are at our disposal.
Bio: Sidney Richard Coleman was an American theoretical physicist who studied under Murray Gell-Mann. He is notable for his research in high-energy theoretical physics.