I believe most plain girls are virtuous because of the scarcity of opportunity to be otherwise.
I believe many simple or plain girls tend to be virtuous because they often lack the chances to behave otherwise. Their circumstances and limited opportunities shape their behavior, leading them to uphold traditional virtues.
This perspective suggests that their virtue is not necessarily a reflection of inherent moral superiority but rather a result of restricted choices available to them. The quote highlights how environment and circumstances can influence moral and behavioral traits.