an equation.........................

 

Einstein wrote an equation that says that R is equivalent to the energy of matter.  That is to say: space curves where there is matter.  That is it.  The equation fits into half a line, and there is nothing more.  A vision—that space curves—became an equation.

     But within this equation there is a teeming universe.  And here the magical richness of the theory opens up into a phantasmagorical succession of predictions that resemble the delirious ravings of a madman but all have turned out to be true.

-Carlo Rovelli, Seven Brief Lessons on Physics