In mode three, the quality for which a cause is proposed is not actually established, but its occurrence is possible in itself. The poet imagines it and supplies a subtle reason.
In the first two modes the event itself was established and only the explanation was invented. Here the occurrence may also be imagined, though nothing in reason rules it out. This distinction between the possible and the impossible separates modes three and four.
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The Dialectical Method and Elegant Causal Attribution: Proof and Four Modes of Ḥusn al-Taʿlīl
In mode three, the quality for which a cause is proposed is not actually established, but its occurrence is possible in itself. The poet imagines it and supplies a subtle reason.
In the first two modes the event itself was established and only the explanation was invented. Here the occurrence may also be imagined, though nothing in reason rules it out. This distinction between the possible and the impossible separates modes three and four.