واشترط في الشعر أن يكون الكلام جارياً على قانون اللغة
It is required of poetic language that it follow the conventions of language.
Imagination does not remove the need for meaningful expression. Words must still allow the hearer to grasp a comprehensible image or idea.
Yet grammatical and linguistic acceptability are not the same as logical truth. A metaphorical sentence can be well formed and imaginatively powerful without being literally factual.