بيان إمكانه إذا كان أمراً غريباً يمكن أن يخالف فيه ويدّعي امتناعه
Demonstrating its possibility when the matter appears strange, may be disputed, or may be alleged impossible.
In explaining possibility, the speaker faces an assertion about the subject that a listener might initially reject as unlikely or impossible. The comparison term supplies an accepted case displaying the relevant kind of occurrence, thereby showing that the claim is not intrinsically impossible.
The aim is not primarily to quantify a feature; it is to remove resistance to the possibility of the asserted condition. To be persuasive, the analogy should appeal to a case the audience can recognise rather than to a second, even more dubious example.