"The law is not a science, for its purpose is not to find out natural facts. It is an art as architecture is an art: its function is practical, but it is enhanced by such qualities as elegance, economy and clarity. The law has two practical purposes: first, to require, forbid or penalise forms of conduct between citizen and citizen, and citizen and State; secondly, to provide formal rules for classes of human activity whose fulfilment would otherwise be confused, uncertain or ineffective. Laws in the former category include every provision for a remedy"--