首楞嚴義疏注經 2.78

2.78

若以此驗之，則知汝身與如來身比竝類例，顯發彰明，佛身是正，汝身應倒。亦可若以佛之見手類顯佛身，明知佛身名正遍知。若以汝之見手比竝汝身，明知汝身號性顛倒。汝胡非是顛倒行事？正遍知者，離倒名正，窮盡法界名遍知。凡夫二乘無此號者，皆顛倒故。

If tested by this, then know that when your body is compared and paralleled with the Tathāgata's body, revealing and demonstrating them, the Buddha's body is upright, and your body must be inverted. Alternatively, it can be read: if the Buddha's body is analogously revealed through the Buddha's seeing the hand, one clearly knows the Buddha's body is named Right and Universal Knowledge; if your body is compared alongside your seeing the hand, one clearly knows your body is designated as of an inverted nature. How are you not acting in an inverted manner? 'Right and Universal Knowledge' (samyak-saṃbuddha): separated from inversion, it is named 'right'; exhaustively fathoming the dharmadhātu, it is named 'universal knowledge.' Ordinary beings and those of the two vehicles do not have this designation because all are inverted.