It must be remembered that the sea is a great breeder of friendship. Two men who have known each other for twenty years find that twenty days at sea bring them nearer than ever they were before, or else estrange them.

In this quote, Gilbert Parker highlights the unique way that the sea can either deepen or strain friendships. He suggests that spending time on the sea, particularly in close quarters, has a powerful effect on relationships. Whether it's a bonding experience that brings two people who have known each other for years even closer, or an experience that causes them to grow apart, the sea serves as a catalyst that exposes the true nature of their connection.

Parker’s statement underscores the idea that friendships are tested in difficult or confined circumstances, where external distractions are minimal, and individuals are forced to interact more directly. The metaphor of the sea suggests that the vast, uncontrollable environment of the ocean can mirror the unpredictable nature of human relationships. The time spent together, away from distractions, can either reveal a stronger bond or create tensions that lead to estrangement.

The origin of this insight likely comes from Parker’s own experiences or observations of people who have spent extended periods at sea, particularly in the context of exploration or maritime work. As a writer, Parker was influenced by the themes of adventure, human connection, and the challenges that come with distance and isolation. His perspective on how the sea influences relationships reflects broader truths about how extreme conditions can test the strength of personal bonds.

Ultimately, Parker’s quote speaks to the idea that friendship is often most vulnerable in challenging, intense situations. The sea acts as a magnifying glass, revealing both the best and worst aspects of a relationship. In such circumstances, friends can either grow closer through shared adversity or find that their differences drive them apart.