The application, or putting into effect, of any legal act presupposes a logically prior stage: its interpretation. Everyone who applies a legal act is interpreting it, and, in doing so, is, consciously or unconsciously, following a certain method. Viewed as an intellectual exercise, legal interpretation presupposes the existence of an act creating or determining rights and obligations, prescribing action or abstention from action: in short, designed to give rise to legal consequences. Every system of law deriving from formal sources necessarily involves some such process. On the other hand, it is difficult to speak of legal interpretation properly so called in the context of a system of moral precepts such as the law of nature, which remain more or less indefinite and which are arrived at by means of conjecture based on pure reason, and do not entail any immediate juridical consequences. Gény put it this way:
“Proceedings on the assumption of the absolute power of human reason to discover the laws of human nature, both in principle and in detail, the natural law school intended to create, by the mere force of thinking, a complete system of absolute, immutable, directly and universally applicable law that the legislature had only to put into words,…”