Good writing has to come from your own ideas; you can't just copy others.
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The 《木兰辞》 opens with Mulan at her loom: 不闻机杼声，惟闻女叹息 'we hear no sound of the loom, only the girl sighing'. From weaving a pattern of one's own came the figurative sense in 自出机杼 'to write with original ideas'.
