Let us then discuss these virtues afresh, going more deeply into the matter.

Let it be assumed that there are five qualities through which the mind achieves truth in affirmation or denial, namely Art or technical skill,τέχνη, Art, as appears below, stands for εὐτεχνία and means here craftsmanship of any kind; it includes skill in fine art, but is not limited to it. Scientific Knowledge, Prudence, Wisdom, and Intelligence. Conception and Opinion are capable of error.