Here's how it evolved:
* Historically: In the past, candles were the primary source of light. A dim candle wouldn't be able to compete with a brighter light source, like a torch or a fireplace.
* Figurative meaning: The phrase evolved to mean that someone or something is inferior to another person or thing. Just as a dim candle can't compete with a brighter light, someone who "can't hold a candle to" another person is not as good, talented, or successful.
Example:
* "My singing voice can't hold a candle to Beyoncé's."
Therefore, the phrase "hold a candle to" implies a comparison of quality or ability, where one person or thing is significantly less impressive than the other.