Quoting famous lines from other people's novels in a novel was not technically plagiarism because it was legal. Quoting famous sentences from other people's novels could add literary value to the novel and bring inspiration to the readers. However, if the quote was too frequent, copied and pasted directly, or the quote was tampered with or modified at the same time, making the entire novel seem incoherent or unnatural, it might be regarded as plagiarism. Quoting famous sentences from other people's novels in novel writing was a relatively common literary technique, but one should also pay attention to moderate use to avoid excessive plagiarism.