"Non-scientists sometimes blur the distinction between the intimidating language- mathematics- in which physics is developed and the engrossing ideas with which it tussles. But that would be like my trying to asess Huckleberry Finn by reading it in Greek. While I use the Greek alphabet all the time, I don't speak a word of the language..."

Here Greene, still in the Preface, stresses the conceptual nature of physics, and the requirement that the ideas be understood logically through words as well as calculated with mathematics. Therein lies the bilingualism of physics.