By habit they are disposed to discover what the good of another actually is in this or that circumstance, to think that they are obliged to make this discovery, and to realize that neither disposition can be fulfilled without attention being paid. Since it is human relations that justice regards and sets right, relations mediated through external actions and things, it is not any and every good of another that we are obliged to provide in act but only the good that is actually due this or that person given their specific relation to us in this or that circumstance. Determining what the good of another amounts to is one thing. Concluding that this particular person is due this particular good from us in this specific circumstance is another thing altogether. Each of these determinations requires iudicium and presumably the just act tolerantly when their habitual disposition to offer the good that is due in response to disagreement and difference elicits sound judgment about the character of that response. They act tolerantly when they conclude that this particular response to this particular objectionable difference is what this particular person is due in this particular circumstance.So far so good, but other matters remain murky. For example, what does it mean to say that a paradigmatic act of tolerance—the patient endurance of another’s objectionable difference—is good, that it delivers their good to them, something they are due by right? Well, if tolerance is a virtue, then as habit and act it must be, like the other moral virtues, a mixed good, both good in itself and an instrument that helps the tolerant achieve other ends, other goods. This is what it means to say that a virtue confers not only aptness to act in this way or that, “but also the right use of that aptness.^ And it is because a virtue has this dual aspect that it “makes its possessor good, and his work good likewise” 07" I-II.56.3).