I've been trying to think of particular books that have had a major effect on me but I've read so much over so long that after a while the sources of inspiration begin to blend together.
The only two I could quickly name off-hand would be Voltaire's Candide and Douglas Hofstadter's Gödel, Escher, Bach. I'm sure there are many others but dangit I just can't think of them when put on the spot.
Feel free to add in your own personal life-changing books.
Most people think King would be the last person to own a gun. Yet in the mid-1950s, as the civil rights movement heated up, King kept firearms for self-protection. In fact, he even applied for a permit to carry a concealed weapon.
...William Worthy, a journalist who covered the Southern Christian Leadership Conference, reported that once, during a visit to King's parsonage, he went to sit down on an armchair in the living room and, to his surprise, almost sat on a loaded gun. Glenn Smiley, an adviser to King, described King's home as "an arsenal."
Aaron Worthing points out that King wasn't quite as dedicated to pure non-violence as he always claimed in his speeches. This may make him somewhat dishonest but also more human and practical - and ultimately a better role model for real people than Gandhi was.