俱舍論記 20.25

20.25

「尊者世友至置千名千」者，此即第三師說。世是天名，與天遂友故名世友。父母憐子，恐惡鬼神之所加害，言天遂友，彼不敢損故，故以為名焉。梵名筏蘇密呾囉，筏蘇名世，密呾囉名友。舊云和須密，訛也。彼作是說：由位不同，三世有異。彼謂諸法行於世時，至三世位位中，作三世異異說。由三位有別，非三體有異。如運一籌置一位處名一，置百位處名百，置千位處名千，雖歷位有別，而籌體無異。

Regarding "Venerable Vasumitra ... placed in the thousands position is called a thousand": this is the explanation of the third master. *Vasu* is the name of a deity; being a companion to the deity, he is called Vasumitra. His parents loved their child, and fearing harm inflicted by evil spirits, they said the deity was his companion so that they would not dare to harm him, hence he was named thus. In Sanskrit *Vasumitra*: *Vasu* means the deity, and *mitra* means friend. The old translation *hosumi* was erroneous. He says: Due to difference in state (avasthā), there is distinction among the three periods of time. He maintains that when dharmas traverse the periods of time, when they reach the states of the three periods, distinct designations of the three periods are made in each state. Due to the distinction among the three states, it is not that the three substances are distinct. Just as moving a single counting token, placing it in the units position it is called one, placing it in the hundreds position it is called a hundred, placing it in the thousands position it is called a thousand; although passing through different positions it is distinct, the substance of the counting token is not different.