"Einstein was not a mathematician, but a physicist who had mixed feelings about mathematics. ...[H]e had enormous respect for the power of mathematics to describe the workings of nature, and he had an instinct for mathematical beauty ...On the other hand, he had no interest in pure mathematics, and he had no technical skill as a mathematician. In his later years he hired younger colleagues... assistants to do mathematical calculations for him. His way of thinking was physical rather than mathematical. He was supreme among physicists as a bird who saw further than others."