Philosopher Mark Kingwell thinks about thinking for yourself in an era of radical know-it-all-ism.

?Question authority,? the popular 1960s slogan commanded. ?Think for yourself.? But what started as a counter-cultural catchphrase, playful in logic but serious in intent, has become a practical paradox. Yesterday's social critics are the tone-policing tyrants of today, and critical theory that once augured emancipation has hardened into ideological enforcement. The resulting crisis of authority, made worse by rival political factions and chaotic public discourse, has exposed cracks in every facet of shared social life. Politics, academia, journalism, medicine, religion, science?every kind of institutional claim is now routinely subject to objection, investigation, and outright disbelief. A recurring feature of this comprehensive distrust of authority is the firm, indeed unshakeable, belief in personal righteousness and superiority: what Mark Kingwell calls ?addiction to conviction.?

In this critical survey of the predicament of contemporary authority, Kingwell draws on philosophical argument, personal reflection, and details from the headlines in an attempt to reclaim the democratic spirit of questioning authority and thinking for oneself. Defending a program of compassionate skepticism, Kingwell illuminates the connection between humility about human limits, including the limits of certainty, and the infinite project of justice.

Mark Kingwell is a professor of philosophy at the University of Toronto, a fellow of the Royal Society of Canada, and a contributing editor of Harper's Magazine.