A horse I can see, but horsehood I cannot see.
ἵππον μὲν ὁρῶ, ἱππότητα δὲ οὐχ ὁρῶ.

Philosophers
Antisthenes
Greek philosopher (c. 446-366 BC), pupil of Socrates, traditional founder of Cynicism. He taught that virtue is a matter of deeds and alone suffices for happiness, laying the ascetic foundations Stoics would inherit.
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Source: シンプリキオス『アリストテレス・カテゴリー論注解』208.28-32 (アンティステネスのプラトン批判として伝承)Verified