Reply to Objection 4: According to Augustine (De Serm. Dom. in Monte i, 19) this precept of Our Lord is to be understood of the preparedness of the mind, namely, that man should be prepared, if it be expedient, to suffer being harmed or defrauded, rather than go to law. But sometimes it is not expedient, as stated above (ad 2). The same applies to the saying of the Apostle.
Reply to Objection 5: The scandal which the Apostle avoided, arose from an error of the gentiles who were not used to this payment. Hence it behooved him to forego it for the time being, so that they might be taught first of all that such a payment was a duty. For a like reason the Church refrains from demanding tithes in those countries where it is not customary to pay them.