This book can be downloaded and read in iBooks on your Mac or iOS device.
The Symposium is a philosophical text by Plato dated c. 385–380 BC.  It concerns itself at one level with the genesis, purpose and nature of love, and (in latter-day interpretations) is the origin of the concept of Platonic love.
A very interesting and impactful read on the subject of love as seen by Greek thinkers. Contrasts very well with current thoughts of love!