Religio Medici, or, The Religion of A Doctor is the spiritual testament of Sir Thomas Browne and an example of early psychological self-portrait in words.  This work became a European best seller.   An interesting side discussion within this work is that of the relationship between science and religion.

It is structured in two parts.  The first being based on the virtues of Faith and Hope.  The second, on the virtue of Charity.  In these are expressed belief in sola fide, or justification by faith alone.  Browne also expounds on Hell, the last judgment, the resurrection and other key tenets of Protestantism.

Religio Medici may be read here:

http://www.bartleby.com/3/5/11.html

Or, alternatively, listened to here as well as other works by Sir Thomas Browne:

https://www.youtube.com/watch?v=I6CdafksOzs