[453] "Then indeed, Anuruddha, as I was dwelling diligent, ardent (ātāpī), and resolute, I perceived both light and the vision of forms. But before long that light of mine vanished, and the vision of forms. Then, Anuruddha, it occurred to me: 'What now is the cause, what is the condition, whereby my light vanishes, and the vision of forms?' Then, Anuruddha, it occurred to me: 'Inattention (amanasikāra) arose in me; and on account of inattention my concentration (samādhi) fell away. When concentration fell away, the light vanished, and the vision of forms. I shall act in such a way that neither doubt (vicikicchā) nor inattention will arise in me again.'"
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.