Enneads VI.2: The Categories of Plotinos
Knowledge Is Either a Movement or Something Composite
Knowledge is pre-eminently movement; for it is the intuition of essence; it is an actualization, and not a simple habit. It should, therefore, also be reduced to movement. It may also be reduced to stability (if considered as a durable actualization); or rather, it belongs to both genera. But if it belong to two different genera, it is something of a blend; but anything blended is necessarily posterior (to the elements which enter into the blend, and it cannot therefore either be a primary genus).