This Article places conflict between Congress and Supreme Court over Religious Freedom Restoration Act in context of long-standing theoretical confusion about meaning and scope of the of Both courts and commentators are inclined to misjudge scope of freedom Clause guarantees. When courts overestimate extent of fully realized guaranty, they tend to retreat out of concern that recognizing right will dissolve social contract and create society in which each person is a law unto herself. When they underestimate Clause, they tend to interpret it in ways that strip it of any meaning independent of Free Speech and Establishment Clauses.The Article explores contours of principled definition of the of as liberty distinct from Constitution's protections of speech and freedom from establishment. It first discusses problems raised by defining religion. The two possible poles of such definition are Emile Durkheim's purely social and behavioral definition and William James's purely internal and individual definition. Some judges and commentators apparently believe should be limited to Judeo-Christian religious traditions. American history and case law, however, suggest fourth possible meaning-a religion is protected by Clause if it agrees to abide by same rules of civil society that American religions obey.A different problem is posed by words the exercise. Historical analysis of this term has proved inconclusive; Article proposes to educe principled meaning of term by viewing it in context of Constitution, as embodying liberty distinct from others guaranteed in document but limited by them. Such principled meaning must protect more than mere more than opinion and ritual behavior, and perhaps even more than opinion, ritual behavior, and non-ritual behavior with potential consequences in larger society. Some judges and commentators, in fact, have even extended their definitions to include coercive actions taken by believers against others who do not share their religious commitments.The attempt to define coercive practices as free exercise introduces idea of limitations on concept. Some are internal; that is, they arise out of logical meaning of term. Others are external; they flow not from logical meaning of the exercise but from values embodied in unrelated portions of Constitution. The most prominent is Establishment Clause, but courts and commentators have mounted arguments for other sections of Constitution.The Article then argues that concept of must be considered within context in which specific claim arises. Cases in which individuals assert their own rights against coercive power of state are different, in theory and practice, from cases in which religious organizations advocate for their corporate prerogatives. In addition, claims should be adjudicated differently depending on whether they arise in context of individualized determination, such as an unemployment compensation claim, or of what Article calls categorical norm-a legal rule that allows for no individualized exceptions. Challenges to categorical norms seem to implicate concern for anarchy mentioned above. The Article, however, argues that some norms are only pseudo-categorical in nature: that is, though by their language they seem to apply generally, their structure and history reveal desire to harm religious minority. When challenger confronts truly categorical norm, Article suggests, courts should ask whether challenge arises because religious belief asserted opposes very goal of norm or because it seeks sincerely to work in concert with norm by different path. Religious challenges to underlying goal of norm cannot be sustained by principled definition of free exercise. However, if believer can show that her religious practice seeks to further underlying goal embodied by norm, and, further, that granting an accommodation will not unduly complicate general problem of enforcement, courts should craft an exemption. The Article suggests that this kind of case will be far rarer than courts and commentators seem to fear, and that deciding it is within traditional institutional competence of judiciary.