[543] Therein, what is the awakening factor of mindfulness (satisambojjhaṅga)?
Here a bhikkhu is mindful, endowed with supreme mindfulness and discretion (satinepakka), one who remembers and recollects what was done long ago and what was spoken long ago. This is called the awakening factor of mindfulness.
Dwelling thus mindful, he investigates that dhamma with wisdom (paññā), examines it, and enters upon a thorough scrutiny of it. This is called the awakening factor of investigation of dhammas (dhammavicayasambojjhaṅga).
For him who investigates that dhamma with wisdom, examines it, and enters upon a thorough scrutiny of it, energy (vīriya) is aroused, unflagging. This is called the awakening factor of energy (viriyasambojjhaṅga).
For one whose energy is aroused, there arises rapture (pīti) not of the flesh (nirāmisā). This is called the awakening factor of rapture (pītisambojjhaṅga).
For one whose mind is rapturous, the body becomes tranquil, and the mind (citta) too becomes tranquil. This is called the awakening factor of tranquility (passaddhisambojjhaṅga).
For one whose body is tranquil, who is happy, the mind becomes concentrated. This is called the awakening factor of concentration (samādhisambojjhaṅga).
He thoroughly looks on with equanimity at the mind thus concentrated. This is called the awakening factor of equanimity (upekkhāsambojjhaṅga).
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.