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We functionally strengthen the indeterminate mental factors: The Abhidhamma in Practice, N.K.G. Mendis. Section The Cetasikas, subcategory, Sankharas. Access to Insight.
Abbreviations in footnotes: AN: Aṅguttara Nikāya, DN: Dingha Nikāya, MN: Majjhima Nikāya, SN: Saṃyutta Nikāya