Authorship and Origin:

It is not clear exactly when Paul wrote Philippians, but it is widely viewed that it was near the end of his life perhaps from Rome as a prisoner. Paul was in prison in Rome for about two years (Acts 28:16, 30-31) around 60-62 A.D.. If it was written before that, then it could be perhaps as early as 54 A.D. from Ephesus.

Overview and Significant sections

This book has three sections, which although clearly written by Paul, seem to be disjointed from each other. It may be that the letter was dictated at three different times which would account for the differences in tone, or it may be an accumulation of two or three letters by Paul all to Philippi. It is not clear, but there is an abrupt change between 3:1 and 3:2. Either the first letter then continues at 4:20, or another letter is then started.

Significant sections:

For more detailed study:
Read Chapter 1. (the entire book is available here.)
The Concise Matthew Henry Commentary on this book. study of this book.
the World Wide Study Bible has Dictionary, Commentary, Scripture and sermons available on this book.