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The tradition distinguishes the mind itself, which knows an object, from the mental factors that colour the knowing. The Abhidharma counts fifty-one: the five ever-present factors, feeling, discrimination, intention, contact and attention; the five that fix on an object; the eleven virtuous factors; the root and secondary afflictions; and the four that can go either way. It is a vocabulary for the inner life more precise than most languages possess.
The pages here will present the fifty-one factors in their groups, with their definitions.