Far from being the pious injunction of a Utopian dreamer, the command to love one's enemy is an absolute necessity for our survival.

Advocating love as strength and non-violence as the most powerful weapon there is, these sermons and writings from the heart of the civil rights movement show Martin Luther King's rhetorical power at its most fiery and uplifting.

GREAT IDEAS. Throughout history, some books have changed the world. They have transformed the way we see ourselves - and each other. They have inspired debate, dissent, war and revolution. They have enlightened, outraged, provoked and comforted. They have enriched lives - and destroyed them. Now Penguin brings you the works of the great thinkers, pioneers, radicals and visionaries whose ideas shook civilization and helped make us who we are.