Experience
Experience is the knowledge or mastery of an event or subject gained through involvement in or exposure to it. Terms in philosophy such as "empirical knowledge" or "a posteriori knowledge" are used to refer to knowledge based on experience. A person with considerable experience in a specific field can gain a reputation as an expert. The concept of experience generally refers to know-how or procedural knowledge, rather than propositional knowledge: on-the-job training rather than book-learning.
Law
Law is a system of rules that are created and enforced through social or governmental institutions to regulate behavior. Law is a system that regulates and ensures that individuals or a community adhere to the will of the state. State-enforced laws can be made by a collective legislature or by a single legislator, resulting in statutes, by the executive through decrees and regulations, or established by judges through precedent, normally in common law jurisdictions. Private individuals can create legally binding contracts, including arbitration agreements that may elect to accept alternative arbitration to the normal court process. The formation of laws themselves may be influenced by a constitution, written or tacit, and the rights encoded therein. The law shapes politics, economics, history and society in various ways and serves as a mediator of relations between people.
System
A system is a regularly interacting or interdependent group of items forming an integrated whole. Every system is delineated by its spatial and temporal boundaries, surrounded and influenced by its environment, described by its structure and purpose and expressed in its functioning.
Experience
Experience is a mere whiff or rumble, produced by enormously complex and ill-deciphered causes of experience; and in the other direction, experience is a mere peephole through which glimpses come down to us of eternal things.
George Santayana, letter to the Marchesa Iris Origo (May 1933) The Letters of George Santayana, ed. Daniel Cory (1955).
Law
We must not, by any whimsical conceits supposed to be adapted to the altering fashions of the times, overturn the established law of the land: it descended to us as a sacred charge, and it is our duty to preserve it.
Lord Kenyon, C.J., Clayton v. Adams (1796), 6 T. R. 605.