John Chrysostom
He does not say: that I may see you before my departure from this life, which would have greatly saddened Timothy. Instead he says: because I remain alone, and have no one to help me.
"For Demas has forsaken me, having loved this present age, and has gone to Thessalonica." That is, having loved ease, a safe and quiet life, he preferred to enjoy himself at home rather than suffer with me and share my present dangers.
He reproaches Demas alone, yet wishing not to reproach him, but to strengthen us, so that we may not grow weak in spirit amid dangers and labors. This is what the words mean: "having loved this present age."
At the same time, he wished to bind his disciple more closely to himself.
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"Crescens to Galatia, Titus to Dalmatia." He does not reproach them, because Titus was one of the most admirable men. Paul entrusted him with church affairs on an island that was not small, but very large. I mean Crete.
"Luke alone is with me." He remained inseparably with Paul. He wrote the Gospel and the catholic Acts. He was industrious, inquisitive, and patient.
Of him the Apostle says in another Epistle: "whose praise in the Gospel is in all the churches" (2 Cor 8:18).