[523] "'The signless concentration of mind (animitta cetosamādhi), the signless concentration of mind,' it is said. What now is the signless concentration of mind? Then, friends, it occurred to me: 'Here a bhikkhu, through non-attention to all signs (nimitta), enters and dwells in the signless concentration of mind. This is called the signless concentration of mind.' Then, friends, through non-attention to all signs, I entered and dwelt in the signless concentration of mind. While I was dwelling in that dwelling, friends, consciousness arose in me that followed after signs. Then, friends, the Blessed One, approaching me by spiritual power (iddhi), said this: 'Moggallāna, Moggallāna! Do not be negligent, brahmin, regarding the signless concentration of mind. Steady your mind (citta) in the signless concentration of mind; unify your mind in the signless concentration of mind; concentrate your mind in the signless concentration of mind.' Then, friends, on a later occasion, through non-attention to all signs, I entered and dwelt in the signless concentration of mind. Indeed, friends, if one speaking rightly could say of anyone: 'He is a disciple who, assisted by the Teacher, attained to greatness of direct knowledge (mahābhiññatā),' it is of me that one speaking rightly could say: 'He is a disciple who, assisted by the Teacher, attained to greatness of direct knowledge.'"
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.