Ambrose of Milan
Catena Aurea · Lukasevangelium 3
And the people asked him, saying, What shall we do then? He answereth and saith unto them, He that hath two coats, let him impart to him that hath none; and he that hath meat, let him do likewise. Then came also Publicans to be baptized, and said unto him, Master, what shall we do? And he said unto them, Exact no more than that which is appointed you. And the soldiers likewise demanded of him, saying, And what shall we do? And he said unto them, Do violence to no man, neither accuse any falsely; and be content with your wages.
For other commands of duty have reference only to individuals, mercy has a common application. It is therefore a common commandment to all, to contribute to him that has not. Mercy is the fulness of virtues, yet in mercy itself a proportion is observed to meet the capacities of man’s condition, in that each individual is not to deprive himself of all, but what he has to share it with the poor.