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.

Michel de Montaigne was the originator of the modern essay form; in these diverse pieces he expresses his views on relationships, contemplates the idea that man is no different from any animal, argues that all cultures should be respected, and attempts, by an exploration of himself, to understand the nature of humanity.

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On friendship

I was watching an artist on my staff working on a painting when I felt a desire to emulate him. The finest place in the middle of a wall he selects for a picture to be executed to the best of his ability; then he fills up the empty spaces all round it with grotesques, which are fantastical paintings whose attractiveness consists merely in variety and novelty. And in truth what are these Essays if not monstrosities and grotesques botched together from a variety of limbs having no defined shape, with an order sequence and proportion which are purely fortuitous?