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"To yield readily—easily—to the persuasion of a friend is no merit with you."
"To yield without conviction is no compliment to the understanding of either."
"You appear to me, Mr. Darcy, to allow nothing for the influence of friendship and affection. A regard for the requester would often make one readily yield to a request, without waiting for arguments to reason one into it." (10.35-37)
In this banter between Darcy and Elizabeth (which, incidentally, is one of the first times he gets a sense of the "lively mind" that he talks about falling in love with later), we get one of the several philosophical questions discussed in the novel: just how much should you listen to your friends? Should you listen or should you demand proof for their opinions?