Animittapañhāsutta
“‘Animitto cetosamādhi, animitto cetosamādhī’ti vuccati. Katamo nu kho animitto cetosamādhīti? Tassa mayhaṁ, āvuso, etadahosi: ‘idha bhikkhu sabbanimittānaṁ amanasikārā animittaṁ cetosamādhiṁ upasampajja viharati. Ayaṁ vuccati animitto cetosamādhī’ti. So khvāhaṁ, āvuso, sabbanimittānaṁ amanasikārā animittaṁ cetosamādhiṁ upasampajja viharāmi. Tassa mayhaṁ, āvuso, iminā vihārena viharato nimittānusāri viññāṇaṁ hoti.
A Question About the Signless
“They speak of this thing called the ‘signless immersion of the heart’. What is the signless immersion of the heart? It occurred to me: ‘It’s when a mendicant, not focusing on any signs, enters and remains in the signless immersion of the heart. This is called the signless immersion of the heart.’ And so … I was entering and remaining in the signless immersion of the heart. While I was in that meditation, my consciousness followed after signs.