Areopagitica is John Milton's passionate defense of free speech and freedom of the press, written as a speech to England's Parliament in 1644. Milton argues that people should be trusted to read different ideas and make their own decisions about truth, rather than having the government censor books before publication. He compares censorship to trying to stop a hydra (a mythical multi-headed monster) and believes that encountering different viewpoints actually helps people become wiser and stronger in their beliefs. This powerful work is considered one of history's most important arguments for intellectual freedom and the right to share ideas openly.