[227] Which, at that time, is the power of concentration (samādhibala)?
That which at that time is stability of the mind (citta), steadfastness, steadiness, non-scattering, non-distraction, the state of an unscattered mind, serenity (samatha), the faculty of concentration (samādhindriya), the power of concentration, right concentration (sammāsamādhi), the concentration factor of awakening (samādhisambojjhaṅga), a factor of the path, included in the path — this, at that time, is the power of concentration.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.