The first thing an animal perceives is itself.
πρῶτον τὸ ζῷον αἰσθάνεται ἑαυτοῦ.

Philosophers
Hierocles
Roman Stoic of the second century AD, known almost entirely through one papyrus recovered at Hermopolis in 1901. His concentric-circles model of cosmopolitanism remains a key tool in modern moral philosophy.
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Source: ヒエロクレス『倫理学綱要』ヘルモポリス・パピルス第1欄 (Bastianini-Long校訂)Verified