瑜伽師地論略纂 12.9

12.9

「攝四善友」者，言此四可親，應當親之。如彼經說：一、止非友，惡事相止；二、慈愍友，苦事相怜；三、利人友，樂事相與；四、同事友，善事相同。一一之中，各有四種，不可煩引，廣如彼經。

Regarding "embracing the four good friends," it means that these four are worthy of intimacy and one should be intimate with them. As that sūtra says: first, a friend who restrains from wrongdoing, who restrains one in evil matters; second, a compassionate friend, who pities one in painful matters; third, a friend who benefits others, who shares with one in joyful matters; fourth, a companion friend, who is united with one in wholesome matters. Within each one there are four kinds, which cannot be cited in detail; it is explained at length as in that sūtra.