1. Sūka Sutta.– If a spike of bearded wheat or barley is badly grasped by hand or foot, it does not pierce the hand or foot or draw blood; but it will if firmly grasped. Similarly a monk with misdirected view and misdirected practice will not pierce ignorance or give rise to knowledge; but it will if well directed. S.v.10.
2. Sūka Sutta.– If a spike of bearded wheat or barley is firmly grasped it can pierce the hand or foot and draw blood. Similarly, a monk with rightly directed view and practice can pierce ignorance and give rise to knowledge. S.v.48.