And how is the heart’s release by equanimity developed? What is its destination, apex, fruit, and end? It’s when a mendicant develops the heart’s release by equanimity together with the awakening factors of mindfulness, investigation of principles, energy, rapture, tranquility, immersion, and equanimity, which rely on seclusion, fading away, and cessation, and ripen as letting go. If they wish: ‘May I meditate perceiving the repulsive in the unrepulsive,’ that’s what they do. If they wish: ‘May I meditate perceiving the unrepulsive in the repulsive,’ that’s what they do. If they wish: ‘May I meditate perceiving the repulsive in the unrepulsive and the repulsive,’ that’s what they do. If they wish: ‘May I meditate perceiving the unrepulsive in the repulsive and the unrepulsive,’ that’s what they do. If they wish: ‘May I meditate staying equanimous, mindful and aware, shunning both the repulsive and the unrepulsive,’ that’s what they do. Or else, going totally beyond the dimension of infinite consciousness, aware that ‘there is nothing at all’, they enter and remain in the dimension of nothingness. The apex of the heart’s release by equanimity is the dimension of nothingness, I say, for a wise mendicant here who has not penetrated to a higher freedom.”

Linked Discourses 46.55 6. Discussion With Saṅgārava

At Sāvatthī. Then Saṅgārava the brahmin went up to the Buddha, and exchanged greetings with him. When the greetings and polite conversation were over, he sat down to one side and said to the Buddha: