法界次第初門 3.52

3.52

十二、性空。性空者，性名自有，不待因緣。若待因緣，則是作法，不名為性。今諸法中皆無性。何以故？一切有為法皆從因緣生，因緣生則是作法。若不從因緣和合，則是無法。如是一切諸法性不可得，故名為性空。

Twelfth: nature-emptiness. Nature-emptiness: 'nature' means existing of itself, not depending on causes and conditions. If it depends on causes and conditions, it is a constructed dharma and is not named 'nature.' Now within all dharmas there is no nature. Why is this? All conditioned dharmas are born from causes and conditions; being born from causes and conditions, they are constructed dharmas. If not from the conjunction of causes and conditions, they are non-existent dharmas. In this way, the nature of all dharmas is unapprehendable, therefore it is called nature-emptiness.