What legal tools did the roman republic use to uphold the rule of law

Gettysburg address question. what is the best line from the address? why do you think so?

The primary purpose of a certificate of confidentiality is to: allow law enforcement to investigate abuse cases.protect researchers from disclosing conflicts of interest.prevent subjects from knowing the purpose of a study.protect identifiable research information from compelled disclosure.

What would you call a political system that is only meant to last for a short time