Acts 20:13

"And we went before to ship, and sailed unto Thasos, there intending to take in Paul: for so had he appointed, minding himself to go afoot." We often find Paul parting from the disciples. For behold again, he himself goes afoot: giving them the easier way, and himself choosing the more painful. He went afoot, both that he might arrange many matters, and by way of training them to bear a parting from him.

But that this Luke was inseparable from Paul, and his fellow-labourer in the Gospel, he himself clearly evinces, not as a matter of boasting, but as bound to do so by the truth itself. For he says that when Barnabas, and John who was called Mark, had parted company from Paul, and sailed to Cyprus, "we came to Troas;" and when Paul had beheld in a dream a man of Macedonia, saying, "Come into Macedonia, Paul, and help us," "immediately," he says, "we endeavoured to go into Macedonia, understanding that the Lord had called us to preach the Gospel unto them. Therefore, sailing from Troas, we directed our ship's course towards Samothracia." And then he carefully indicates all the rest of their journey as far as Philippi, and how they delivered their first address: "for, sitting down," he says, "we spake unto the women who had assembled;" and certain believed, even a great many. And again does he say, "But we sailed from Philippi after the days of unleavened bread, and came to Troas, where we abode seven days." And all the remaining [details] of his course with Paul he recounts, indicating with all diligence both places, and cities, and number of days, until they went up to Jerusalem; and what befell Paul there, how he was sent to Rome in bonds; the name of the centurion who took him in charge; and the signs of the ships, and how they made shipwreck; and the island upon which they escaped, and how they received kindness there, Paul healing the chief man of that island; and how they sailed from thence to Puteoli, and from that arrived at Rome; and for what period they sojourned at Rome. As Luke was present at all these occurrences, he carefully noted them down in writing, so that he cannot be convicted of falsehood or boastfulness, because all these [particulars] proved both that he was senior to all those who now teach otherwise, and that he was not ignorant of the truth.