What did Titus report to Paul about the Corinthians' attitude toward him?
Titus reported that the Corinthians had an earnest desire, mourning, and a fervent mind toward Paul. Their attitude of heart and earnest desire also brought Paul consolation and comfort, showing their affection and concern, not merely Titus's arrival among them.
Les explains that Paul was under pressures, grief, and disappointments, yet God comforted him. In verse 7, God comforted Paul by the coming of Titus, who finally found him. Titus came from Corinth, where he had been working among the Corinthian believers while Paul was at Ephesus. Paul says it was not just Titus's coming that comforted him, but the consolation he received in the Corinthians. Titus told Paul of their earnest desire, mourning, and fervent mind toward Paul—their attitude of heart. That comforted Paul and showed their affection and concern for him.
And not by his coming only, but by the consolation wherewith he was comforted in you, when he told us your earnest desire, your mourning, your fervent mind toward me; so that I rejoiced the more.