That is, that I may be comforted together with you by the mutual faith both of you and me.
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Ambrosiaster
AD 400
Paul says that he will be comforted with them insofar as they come to understand spiritual things. Even while he may rejoice in their faith, he nevertheless grieves insofar as they have not received the faith rightly. The apostle was the type to grieve for the faults of others as if they were his own. “And we are comforted by this,” he says, “by one and the same faith.” In this way the act of comforting is seamless. For it is by the unity of faith that they are brought to maturity in Christ. By this means the ministry of spiritual grace is given through the apostle’s preaching of the gospel and produces its own fruit. Commentary on Paul’s Epistles.