Comfortable Virtues, Easy reading A snippet

Aquinas defined ‘virtue’ as a habit “by which we live righteously, of which no one can make bad use, which God works in us, without us."

A virtue is a good habit.

But what I find reassuring about Aquinas's definition is the little phrase - of which no one can make bad use... That is, when you are acting from virtue, you cannot do a bad act. To act with a virtue is to always do something good. I think this relates to Moral virtues, but am not sure how it relates to intellectual virtues... eg if you have the virtue of surgery, and you perform a marvellous piece of surgical work, but you deliberately kill the patient, then it is a good act of surgery and you have used the virtue of surgery, but clearly morally a bad act.