The Book of Second Corinthians is a letter (epistle) that the Apostle
Paul wrote to the church of God in the city of Corinth (his first visit
there is recorded in Acts 18:1-18) and to all the holy-people in the
whole of Achaia. These people were holy-people (sanctified-people,
Christians, saints, children of the only true God) because they had
already received the gift of holy spirit from God by means of the Lord
Jesus Christ – Paul and others had preached the good-message (gospel) to
them previously and they believed it.
Paul wrote this letter by revelation from God and/or the Lord Jesus
Christ to remind and encourage the holy-people regarding the things of
God, and to teach them more about all that God has made available, which
includes more information regarding the gift of holy spirit which is the
deposit of the new covenant between God and holy-people by means of the
Lord Jesus Christ.
This second letter was written by Paul in Macedonia not long after he and
others had left Asia in the autumn of 57 AD (see Acts 20:1), which was
not many months after he sent his first letter to the Corinthian church.
Corinth was the capital city of the Roman province of Achaia which was
in the southern part of modern-day Greece.