Avicenna says: "And each of these elements has latitude in its quality;
it can be more and less, since its natural or accidental quality
may have been intensified or weakened, while retaining its form and species.
Nevertheless, this intensification and weakening has terminating limits.
Once those limits are transcended the complete disposition in matter for that form is lost
and a complete disposition for another form disposes [that matter]."
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