Because St Paul copied from Greek philosophy he was not using his own thoughts or reasoning, nor being inspired by God, he was copying other people's work, the work of Greek Philosophers.
Acts was quoted:
Acts was written in Greek, presumably by St. Luke the Evangelist. The Gospel According to Luke concludes where Acts begins, namely, with Christ's Ascension into heaven. Acts was apparently written in Rome, perhaps between 70 and 90 ce, though some think a slightly earlier date is also possible.
1 Corinthians and Titus were quoted:
Most scholars agree that Paul actually wrote seven of the Pauline epistles (Galatians, 1 Corinthians, 2 Corinthians, Romans, Philemon, Philippians, 1 Thessalonians), but that three of the epistles in Paul's name are pseudepigraphic (First Timothy, Second Timothy, and Titus) and that three other epistles are of questionable authorship (Second Thessalonians, Ephesians and Colossians). According to some scholars, Paul wrote these letters with the help of a secretary, or amanuensis, who would have influenced their style, if not their theological content.
