Iti 17
Itivuttaka: The Group of Ones
translated from the Pali by
Thanissaro Bhikkhu
This was said by the Blessed One, said by the Arahant, so I have heard: "With regard to external factors, I don't envision any other single factor like admirable friendship[1] as doing so much for a monk in training, who has not attained the heart's goal but remains intent on the unsurpassed safety from bondage. A monk who is a friend with admirable people abandons what is unskillful and develops what is skillful."
A monk with admirable people as friends who's reverential, respectful, doing what his friends advise mindful, alert, attains step by step the ending of all fetters.
Note
1. In SN 45.2 the Buddha says, "Admirable friendship... is actually the whole of the holy life... It is in dependence on me as an admirable friend that beings subject to birth have gained release from birth... aging... death... sorrow, lamentation, pain, distress, & despair." As AN 8.54 points out, admirable friendship means not only associating with good people, but also learning from them and emulating their good qualities.