In Patrick O'Brian's "The Letter of Marque," Stephen expresses surprise at the receding sea, exclaiming, "The sea has receded!" His astonishment reflects a sense of wonder about the natural world and its phenomena. This moment captures a blend of curiosity and exploration, fundamental themes in the narrative.

Jack, in response, clarifies that the sea's retreat occurs regularly due to the tide, explaining a natural occurrence in a casual manner. This exchange highlights the contrast between Stephen's amazement and Jack's familiarity, showcasing their differing perspectives on maritime life and the wonders of nature.