[179] [89] Friends, a bhikkhu endowed with three qualities is capable of practicing for his own good, but not for the good of others. Which three? Here, friends, a bhikkhu is not indeed quick in grasping wholesome dhammas; but (1) he is one who retains the dhammas he has heard; (2) he is one who examines the meaning of the dhammas he has retained; (3) and, having understood the meaning and understood the dhamma, he is one practicing in accordance with the Dhamma. Yet he is not one of lovely speech … [i.e., not a good speaker, endowed with polished, urbane, articulate delivery, faultless, making the meaning clear]; nor is he one who instructs … [encourages, inspires, and gladdens] his companions in the holy life. Endowed with these three qualities, friends, a bhikkhu is capable of practicing for his own good, but not for the good of others.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.