Or to put it otherwise: The primary activity of the mind, observe, is intelligence, but intelligence applied to any object is called a thought, and when this persists and makes on the mind an impression of the object of thought, it is named reflection, and when reflection dwells on the same object and puts itself to the test, and closely examines the relation of the thought to the soul, it gets the name prudence. Further, prudence, when it extends its area forms the power of reasoning, and is called conception, and this is defined as the fullest activity of the soul, arising in that part where reason resides, and being devoid of outward expression: and from it proceeds the uttered word spoken by the tongue. And now that we have discussed the faculties of knowledge, let us turn to the vital or appetitive faculties.