The mental factor to exert heroic effort, constantly and courageously, in helping others and in gaining the skills and working on oneself to be able to help others even more. When conjoined with a bodhichitta aim, it becomes a far-reaching attitude.
Tibetan: བརྩོན་འགྲུས། brtson-'grus
J. Hopkins: Effort
Synonyms: Joyful perseverance; Heroic courage