This passage alludes to Act 1, Scene 3 of Shakespeare’s tragedy
Hamlet, in which the king’s counselor Polonius gives advice to his son Laertes before Laertes travels abroad. Since the character Polonius is notoriously a braggart, the novel may be gently satirizing Yorick and the old French gentlemen’s pat pro-travel sentiments by comparing them to Polonius’s speech. On the other hand, the speech contains the famous advice “to thine own self be true,” which the novel may be unironically endorsing. This passage also introduces Count de B****, another major French character notable for his love of British culture.