Legal interpretation is discovering the solution to the given cases in accordance interpretation with the law now in force. Interpretation is always necessary since there are no clear cases and those who have the task of deciding the interpretation of the law are the judges and civil servants who have to resolve the cases presented to them for their consideration. This characteristic underlines that legal interpretation is the search for a solution based on equity. Another of the tasks of interpretation is the solution of conflicts and, in this sense, the appeal to principles and the logic of reason provides the acceptable solution. This dialectic among the legislature, the judges, the doctrine and public opinion make up the life of the law, in this way reconciling stability and change.