Henry David Thoreau (1817-1862) championed the belief that people of conscience were at liberty to follow their own opinion. In these selections from his writings, we see Thoreau the individualist and opponent of injustice. "Civil Disobedience" (1849), composed following Thoreau's imprisonment for refusing to pay his taxes in protest against slavery and the Mexican War, is an eloquent declaration of the principles that make revolution inevitable in times of political dishonour. "Solitude", from his masterpiece, "Walden" (1854), poetically describes Thoreau's oneness with nature and the companionship solitude offers to those who want to be rid of the travails of the world to discover themselves. "Life without Principle" (posthumously published 1863) decries the way in which excessive devotion to business and money coarsens the fabric of society: in merely making a living, the meaning of life gets lost.