Ambrose of Milan
Catena Aurea · Lukasevangelium 9
Then he called his twelve disciples together, and gave them power and authority over all devils, and to cure diseases. And he sent them to preach the kingdom of God, and to heal the sick. And he said unto them, Take nothing for your journey, neither staves, nor scrip, neither bread, neither money; neither have two coats apiece. And whatsoever house ye enter into, there abide, and thence depart. And whosoever will not receive you, when ye go out of that city, shake off the very dust from your feet for a testimony against them. And they departed, and went through the towns, preaching the Gospel, and healing every where.
Of what kind then he ought to be who preaches the Gospel of the kingdom of God is marked out by these Gospel precepts; that is, he must not require the supports of secular aid; and clinging wholly to faith, he must believe that the less he requires those things, the more they will be supplied to him.