Barnes New Testament Notes

Verse 11. O ye Corinthians, our mouth is open unto you. We speak freely and fully. This is an affectionate address to them, and has reference to what he had just said. It means, that when the heart was full on the subject, words would flow freely, and that he had given vent to the fervid language which he had just used because his heart was full. He loved them; he felt deeply; and he spoke to them with the utmost freedom of what he had thought, and purposed, and done.

Our heart is enlarged. We have deep feelings, which naturally vent themselves in fervent and glowing language. The main idea here is, that he had a strong affection for them; a heart which embraced and loved them all, and which expressed itself in the language of deep emotion, he had loved them so that he was willing to be reproached, and to be persecuted, and to be poor, and to have his name cast out as evil. "I cannot be silent. I conceal or dissemble nothing. I am full of ardent attachment, and that naturally vents itself in the strong language which I have used." True attachment will find means of expressing itself. A heart full of love will give vent to its feelings. There will be no dissembling and hypocrisy there. And if a minister loves the souls of his people, he will pour out the affections of his heart in strong and glowing language.