From the early Church Fathers to now.
1 Orthodox · 1 Catholic
“For even when we were with you, we foretold you that we should suffer tribulations, as also it is come to pass, and you know.”
“It is a great consolation for disciples when the teacher has told them about afflictions beforehand. For afterwards they were not troubled by them as by something unexpected. Therefore Christ also said to the apostles: "I told you before it came to pass, that when it is come to pass, you might believe" (John 14:29). Paul told them not only this, but also many other things, which likewise came to pass.”
“The other consideration strengthening them is a prediction concerning the future, for anticipated difficulties are less harmful. So Paul tells them: for when we were with you, we told you beforehand that we were to suffer affliction, that is, Paul had warned them about the tribulations they would go through in their time.”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.