大般涅槃經義記 7.418

7.418

第二段中，「若眾緣中本無生性而能生」者，舉他無義。下將虛空對之顯有，「虛空無生亦應生果」徵空齊有，俱是本無，何故不生？「虛空不生，非因」已下辯有異空。異相如何？空不生果由其非因，有法是因明有果性，以眾緣中有果性故，合則生果。

In the second section: "If in the various conditions there were fundamentally no nature of production and yet they could produce" cites the opponent's view of nonexistence. Below it contrasts space with it to reveal existence: "Empty space has no production and should also produce the fruit" questions space to equalize it with existence—both are fundamentally nonexistent, so why does it not produce? From "Empty space does not produce because it is not a cause" onward discerns existence as different from space. What is the difference? That space does not produce the fruit is because it is not a cause; existent dharmas are causes, which clarifies that they possess the nature of the fruit. Because the various conditions have the nature of the fruit, when they combine, they produce the fruit.