““The subject of this chapter is string theory, and I begin it with these reflections for two reasons. First, because the main thing that is wrong with string theory, as presently formulated, is that it does not respect the fundamental lesson of general relativity that spacetime is nothing but an evolving system of relationships. Using the terminology I introduced in earlier chapters, string theory is background dependent, while general relativity is background independent. At the same time, string theory is unlikely to be in its final form. Even if, as is quite possible, string theory is ultimately reformulated in a background independent form, history may record that Einstein's view of Newton applies also to the string theorists: when it was necessary to ignore fundamental principle in order to make progress, they had the courage and the judgment to do so.””
![“Einstein, my upset stomach hates your theory [of General Relativity]—it…” quote by Paul Ehrenfest](https://sms4smile.com/quotes/img-quotes/8bf/paul-ehrenfest-52330_answers_einstein-my-upset-stomach-hates-your-the_467759.jpg)
