Add a citation for the source of the following quote: "The greatest wealth is health".
"The greatest wealth is health" (Emerson, R. W., 1860).
Complete the following task based on the instruction and optional input provided.### Instruction:
Add a citation for the source of the following quote: "The greatest wealth is health".

### Output:
"The greatest wealth is health" (Emerson, R. W., 1860).