大方廣佛華嚴經疏 51.20

51.20

四統收攝者，復有四重：一以位收位，六位各各收一切位故。一位即具二千，為萬二千行也。上云一地之中具足一切諸地功德。二以門收門，即二百門，一一各收一切門，即成二百二百為四萬行。三以行收行，一行具一切行，則有二千箇二千行成四兆行。四以略攝廣，此二千行，下頌結云「如大地一塵」，以此一塵之略，說不離十方之廣地，是故攝廣亦無不盡。此乃等無極之法界，越無際之虛空。下頌云「虛空可度量，菩薩德無盡」，斯之謂矣。

Fourth, all-inclusive integration also has four levels: First, using stations to integrate stations: the six stations each integrate all stations. A single station thus possesses two thousand, making twelve thousand practices. Above it says that within a single stage, all merits of all stages are fully possessed. Second, using gates to integrate gates: namely, the two hundred gates, each integrating all gates, thus becoming two hundred times two hundred, making forty thousand practices. Third, using practices to integrate practices: a single practice possesses all practices, so there are two thousand times two thousand practices, making four trillion practices. Fourth, using the concise to encompass the extensive: these two thousand practices are concluded in the verses below as being "like a single speck of dust of the great earth"; using the conciseness of this single speck of dust, it speaks of not departing from the extensive earth of the ten directions; therefore, in encompassing the extensive, nothing is not exhausted. This equals the limitless dharmadhātu and transcends boundless space. The verses below state: "Empty space might be measured, but the bodhisattva's virtues are inexhaustible"—this is what it means.