Here ḥassās means capable of sense-perception, not emotionally touchy. Relative to a tree, the classical scheme treats human as sentient, separating it from plant life. But a horse is sentient too, so this concept does not distinguish the human species from another animal. That is why ḥassās is a remote differentia of human.
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Working through ḥassās
Proximate and Remote Genus and Differentia
Here ḥassās means capable of sense-perception, not emotionally touchy. Relative to a tree, the classical scheme treats human as sentient, separating it from plant life. But a horse is sentient too, so this concept does not distinguish the human species from another animal. That is why ḥassās is a remote differentia of human.