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It is true that law is a practical discipline. However, it is not true that theory has no place in law. Both practice and theory are fundamental pillars of law, and the two of them are necessary in order for legal systems to function successfully.
An example is the law of contract. Contract law refers to the regulations that surround the creation and carrying out of contracts. A contract is a legally binding agreement, usually created for the purpose of exchanging a particular good or service. Contract law establishes guidelines surrounding the creation and maintenance of contracts, as well as the vitiating factors (circumstances in which a contract can be considered void). These rules constitute the theoretical part of contract law, as they are often based on careful studies of other laws in the territory being examined. However, a practical component also exists, as lawyers and judges have to assess real-life cases and the implications that these have on the everyday lives of people.