I answer that, As stated above (Article [2]) humility has essentially to do with the appetite, in so far as a man restrains the impetuosity of his soul, from tending inordinately to great things: yet its rule is in the cognitive faculty, in that we should not deem ourselves to be above what we are. Also, the principle and origin of both these things is the reverence we bear to God. Now the inward disposition of humility leads to certain outward signs in words, deeds, and gestures, which manifest that which is hidden within, as happens also with the other virtues. For "a man is known by his look, and a wise man, when thou meetest him, by his countenance" (Ecclus. 19:26). Wherefore the aforesaid degrees of humility include something regarding the root of humility, namely the twelfth degree, "that a man fear God and bear all His commandments in mind."
Again, they include certain things with regard to the appetite, lest one aim inordinately at one's own excellence. This is done in three ways. First, by not following one's own will, and this pertains to the eleventh degree; secondly, by regulating it according to one's superior judgment, and this applies to the tenth degree; thirdly, by not being deterred from this on account of the difficulties and hardships that come in our way, and this belongs to the ninth degree.
Certain things also are included referring to the estimate a man forms in acknowledging his own deficiency, and this in three ways. First by acknowledging and avowing his own shortcomings; this belongs to the eighth degree: secondly, by deeming oneself incapable of great things, and this pertains to the seventh degree: thirdly, that in this respect one should put others before oneself, and this belongs to the sixth degree.
Again, some things are included that refer to outward signs. One of these regards deeds, namely that in one's work one should not depart from the ordinary way; this applies to the fifth degree. Two others have reference to words, namely that one should not be in a hurry to speak, which pertains to the fourth degree, and that one be not immoderate in speech, which refers to the second. The others have to do with outward gestures, for instance in restraining haughty looks, which regards the first, and in outwardly checking laughter and other signs of senseless mirth, and this belongs to the third degree.