Adam Clarke on Acts 15:36

Let us go - and visit our brethren in every city - This heavenly man projected a journey to Cyprus, Pamphylia, Pisidia, Lycaonia, Salamis, Paphos, Perga, Iconium, Lystra, Derbe, Antioch in Pisidia, and elsewhere; for in all these places he had preached and founded Churches in the preceding year. He saw it was necessary to water the seed he had planted; for these were young converts, surrounded with impiety, opposition, and superstition, and had few advantages among themselves.