Scientific greatness is less a matter of intelligence than character; if the scientist refuses to compromise or accept incomplete answers and persists in grappling the most basic and difficult questions.
Albert EinsteinNewton did not know what happened to the apple, and I can prove this when the next eclipse comes.
Albert EinsteinIt is true that the grasping of truth is not possible without empirical basis. However, the deeper we penetrate and the more extensive and embracing our theories become the less empirical knowledge is needed to determine those theories.
Albert Einstein