Classify this sentence as a product review, legal document, fiction, or philosophical proposition.
"Life is nothing more than an oscillation between joy and suffering."
philosophical proposition
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify this sentence as a product review, legal document, fiction, or philosophical proposition.

### Input:
"Life is nothing more than an oscillation between joy and suffering."

### Output:
philosophical proposition