Rewrite the given equation using an appropriate metaphor.
E= mc^2
"Energy is a locked treasure and mass along with the speed of light squared is the key to unlock it; as depicted by Einstein's famous equation E=mc^2."
Complete the following task based on the instruction and optional input provided.### Instruction:
Rewrite the given equation using an appropriate metaphor.

### Input:
E= mc^2

### Output:
"Energy is a locked treasure and mass along with the speed of light squared is the key to unlock it; as depicted by Einstein's famous equation E=mc^2."