This section and the one before it are a pair. They are both concerned with the relationship of Christianity to an imperfect form of the faith—“the baptism of John.” In this case Paul deals with the situation himself. These verses include also a brief description of his ministry in Ephesus, aspects of which are illustrated in the following section. But again we must turn to Paul’s letters to fill out our knowledge of these years. They show that his achievement in Ephesus was at the cost of much suffering (1 Cor. 15:32; 2 Cor. 1:8; 4:9ff.; 6:4ff.), including, perhaps, an imprisonment (cf. 2 Cor. 11:23) and a “flying visit” to Corinth in an attempt to bring order into that church’s troubled affairs (cf. 2 Cor. 12:14; 13:1; also 2 Cor. 2:1; see disc. on 21:21).

19:1a Paul appears to have ma…