الممكن لا يلزم من فرض وقوعه محال بالنظر إلى ذاته
Assuming the occurrence of a possible thing does not entail an impossibility when viewed in its own essence.
An act is possible in itself if its occurrence or nonoccurrence is not contradictory simply by what the act means. It may nevertheless be precluded by an external, necessary condition in a particular case.
A kind of act can therefore remain conceivable even though affirming it under all established circumstances would be inconsistent. The analysis must not switch unnoticed between the act in itself and the act together with all external constraints.