Over those parts - The parts of country in and near Macedonia. He probably went to Macedonia by Troas, where he expected to find Titus 2-Corinthians 2:12; but, not finding him there, he went by himself to Philippi, Thessalonica, etc., and then returned to Greece proper.
Into Greece - Into Greece proper, of which Athens was the capital. While in Macedonia he had great anxiety and trouble, but was at length comforted by the coming of Titus, who brought him intelligence of the liberal disposition of the churches of Greece in regard to the collection for the poor saints at Jerusalem, 2-Corinthians 7:5-7. It is probable that the Second Epistle to the Corinthians was written during this time in Macedonia, and sent to them by Titus.

He came into Greece - Εις την Ἑλλαδα, Into Hellas, Greece properly so called, the regions between Thessaly and Propontis, and the country of Achaia. He did not, however, go there immediately: he passed through Macedonia, Acts 20:1, in which he informs us, 2-Corinthians 7:5-7, that he suffered much, both from believers and infidels; but was greatly comforted by the arrival of Titus, who gave him a very flattering account of the prosperous state of the Church at Corinth. A short time after this, being still in Macedonia, he sent Titus back to Corinth, 2-Corinthians 8:16, 2-Corinthians 8:17, and sent by him the second epistle which he wrote to that Church, as Theodoret and others suppose. Some time after, he visited Corinth himself, according to his promise, 1-Corinthians 16:5. This was his third voyage to that city, 2-Corinthians 12:14; 2-Corinthians 13:1. What he did there at this time cannot be distinctly known; but, according to St. Augustin, he ordered every thing relative to the holy eucharist, and the proper manner in which it was to be received. See Calmet.

And when he had gone over those parts, and had given them (a) much exhortation, he came into Greece,
(a) For after so great trouble, there was need of much exhortation.

And when he had gone over those parts,.... Of Macedonia, and the cities in it before mentioned;
and had given them much exhortation; to abide by the doctrines and ordinances of the Gospel, and to walk worthy of it in their lives and conversations; and this exhortation he was frequently giving, as often as he had opportunity, improving his time much this way, and continued long at it: and, having pursued it to a sufficient length,
he came into Greece; or Hellas; which, according to Ptolomy (e) and Solinus, (f), is properly true Greece; the former makes it to be the same with Achaia, where Corinth was; and the latter says it was in his time called Attica, where Athens was; so Pliny (g), who also says, that Thessaly was so called: this Hellas included Macedonia, Epirus, Thessaly, Achaia, which is properly Greece, Peloponnesus, and the adjacent islands.
(e) Geograph. l. 3. c. 15. (f) Polyhist, c. 12. (g) Nat. Hist. l. 4. c. 7.

he came into Greece--or Achaia, in pursuance of the second part of his plan (Acts 19:21).

He came into Greece - That part of it which lay between Macedonia and Achaia.