[296] Five kinds of hard-heartedness of mind (cetokhila):
Friends, here a bhikkhu doubts the Teacher, is uncertain about him, is undecided, does not place confidence in him. Friends, when a bhikkhu doubts the Teacher, is uncertain about him, is undecided, does not place confidence in him, his mind (citta) does not incline to ardor, to application, to perseverance, to striving. One whose mind does not incline to ardor, to application, to perseverance, to striving — this is the first hard-heartedness of mind.
Furthermore, friends, a bhikkhu doubts the Dhamma … He doubts the Saṅgha … He doubts the training, is uncertain … He is angry with his companions in the spiritual life, displeased, with a heart struck [by resentment], become hard-hearted. Friends, when a bhikkhu is angry with his companions in the spiritual life, displeased, with a heart struck, become hard-hearted, his mind does not incline to ardor, to application, to perseverance, to striving. One whose mind does not incline to ardor, to application, to perseverance, to striving — this is the fifth hard-heartedness of mind.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.