Expound on the meaning of "juridical necessity" as it is used

in Art. 1156 in connection with Art. 1423. Clarify how this concept relates with extinctive prescription as it is provided in Arts. 1139 and 1424. Provide your own simple example of a contract that illustrates your explanation.

Elaborate on how extra-contractual obligations (i.e., those that arise from quasi-contracts and quasi-delicts) essentially differ from contractual obligations (i.e., those that arise from contracts). Include a brief discussion on the nature of quasi-contracts (Art. 2142) and quasi-delicts (Art. 2176) in your answer.