Know that in regard to another, one can act rightly either by giving oneself to another as far as one can or by giving him something else that belongs to him. The virtue inclining one to the first is friendship, by which one gives oneself to one's neighbor insofar as one can and one's neighbor can have one; and this is the most perfect of the moral virtues, because justice as a whole is more perfect than virtues that are directed to oneself, and this is the most perfect form of justice.
Scotus, Ordinatio III Suppl, dist. 34, as translated by Allan Wolter in Duns Scotus on the Will and Morality, CUA Press (Washington, D.C.: 1997) p. 248.
