Polycarp may have known of more than one Pauline note to Philippi, no longer extant, or he may be referring loosely to 2 Thessalonians, which was addressed to a neighbouring Macedonian church.
Some went so far as to give up their accustomed vocations, and with such Paul had to expostulate in his epistles to the Thessalonians.
It was thus that St Paul came to write his two epistles to the Thessalonians, the oldest Christian documents that we possess.
Both Epistles to the Thessalonians have for their object to calm somewhat the excited expectations of which we have spoken.
Besides this he wrote Cogitationes et dissertationes theologicae, on the principles of natural and revealed religion (2 vols., Geneva, 1737; in French, Traite de la verite de la religion chretienne) and commentaries on Thessalonians and Romans.