151. The theological virtues are those that perfect the intellect and the will with reference to God, their ultimate, supernatural object. They are three: (a) faith, which is a virtue infused into the intellect, giving man supernatural truths that are perceived by a divine light; (b) hope, which is a virtue infused into the will, enabling man to tend towards the supernatural destiny disclosed by faith as towards an end possible of attainment; (c) charity, which is a virtue infused into the will, uniting man’s affections to the object of his hope and transforming him into its likeness. 152. Causes of Virtues.--The causes of virtue are three: (a) nature, which is the cause of the inchoative intellectual and moral virtues, that is, of the theoretical and practical principles that are naturally known, and of the inclinations to virtue that arise from an individual’s bodily constitution; (b) practice, which is the cause of perfected intellectual and moral virtues, that is, of the good habits that are formed by repeated acts (e.g., knowledge obtained through study, temperance fixed in the character through continued effort); (c) infusion from on high, which is the cause of the virtues that surpass nature (i.e., of the theological virtues and of the moral virtues that are concerned with our acts as ordered to the supernatural). 153. Properties of the Virtues.--From the definition of virtue given above certain properties result. (a) Since a virtue makes conduct agree with a certain fixed standard, it does not allow of excess or defect. Hence, virtue follows the golden mean. (b) Since the other moral virtues would go to extremes without the guidance of prudence, and since prudence would not judge aright without the right dispositions of the other virtues, it follows that the four moral virtues, at least in their perfect state, must always be together. And because charity is the fulfillment of the whole law, he who has charity has also all the other infused virtues. (c) Since the virtues are directed towards objects of varying degrees of excellence, and since they are habits, and are capable of increase and decrease (137 sqq.), it follows that both virtues of different species, and those of the same species, are or may be unequal. (d) Since some of the virtues imply conditions that will not exist in the life to come, it follows that these virtues will be somewhat changed in the blessed. Thus, temperance, which subdues the rebellion of the passions, will not be exercised in heaven, where the passions do not rebel. 154. The golden mean is found differently in different virtues.