The quote from Patrick O'Brian's "Master and Commander" suggests that certain behaviors or attitudes may be acceptable in specific environments, like a port, where social norms can be more relaxed. However, when transitioning to the open sea, these same behaviors become inappropriate or impractical, highlighting the different expectations that exist in varied contexts.

This contrast underscores the importance of adapting to circumstances. The sea represents a place of order and discipline, where the challenges faced by sailors require a different mindset than that of social interactions on land. O'Brian's reflection serves to remind readers that environments dictate acceptable conduct and that one must navigate these shifts with awareness.