Trilogy by Rick Levine

Einstein's theory that science proved right:
Energy's made from both mass and light
Although E=mc squared, my dear
The solution is more complex, I fear.

E is for energy, everywhere
C squared is how much that I care
Light forces flowing without constraint
Transmuted into the love of a saint
M is for mass, by which we are bound
With our hearts in the clouds
And our feet on the ground.