I recently bought a copy of Mark Rippetoe's book Starting Strength. It is written from the position of how to coach various lifts. The detail and years of experience poured into piece of work is inspiring.
The book is also filled with great quotes and wit. Here is a quote I have come to really like:
"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, and die galantly.
Specialization is for insects."
- Robert Heinlein
Anyone who is serious about training seriously should own this book.