[133] How many kinds of equanimity regarding formations (saṅkhārupekkhā) arise by way of serenity (samatha)? How many kinds of equanimity regarding formations arise by way of insight (vipassanā)? Eight kinds of equanimity regarding formations arise by way of serenity; ten kinds of equanimity regarding formations arise by way of insight.
Which are the eight kinds of equanimity regarding formations that arise by way of serenity? The wisdom (paññā) that, reflecting upon the hindrances (nīvaraṇa), becomes composed, for the purpose of obtaining the first jhāna, is knowledge (ñāṇa) of the kinds of equanimity regarding formations. The wisdom that, reflecting upon applied thought and sustained thought (vitakka-vicāra), becomes composed, for the purpose of obtaining the second jhāna, is knowledge of the kinds of equanimity regarding formations. The wisdom that, reflecting upon rapture (pīti), becomes composed, for the purpose of obtaining the third jhāna, is knowledge of the kinds of equanimity regarding formations. The wisdom that, reflecting upon pleasure and pain, becomes composed, for the purpose of obtaining the fourth jhāna, is knowledge of the kinds of equanimity regarding formations. The wisdom that, reflecting upon the perception of form (rūpa-saññā), the perception of sensory impingement (paṭigha-saññā), and the perception of diversity (nānatta-saññā), becomes composed, for the purpose of obtaining the attainment of the Sphere of Infinity of Space (ākāsānañcāyatana-samāpatti), is knowledge of the kinds of equanimity regarding formations. The wisdom that, reflecting upon the perception of the Sphere of Infinity of Space, becomes composed, for the purpose of obtaining the attainment of the Sphere of Infinity of Consciousness (viññāṇañcāyatana-samāpatti), is knowledge of the kinds of equanimity regarding formations. The wisdom that, reflecting upon the perception of the Sphere of Infinity of Consciousness, becomes composed, for the purpose of obtaining the attainment of the Sphere of Nothingness (ākiñcaññāyatana-samāpatti), is knowledge of the kinds of equanimity regarding formations. The wisdom that, reflecting upon the perception of the Sphere of Nothingness, becomes composed, for the purpose of obtaining the attainment of the Sphere of Neither Perception Nor Non-Perception (nevasaññānāsaññāyatana-samāpatti), is knowledge of the kinds of equanimity regarding formations. These eight kinds of equanimity regarding formations arise by way of serenity.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.