Rex non potest peccare - "The king can do no wrong." Used to describe the basis for sovereign immunity.⏎
Vigilantibus non dormientibus aequitas subvenit - "Equity aids the vigilant, not the sleeping." Concept that if an opposing party unreasonably delays bringing an action, that it is no longer considered just to hear their claim, due to fundamental changes in circumstance brought upon by their delay.⏎
Ultra posse nemo obligatur - "No one is obligated (to do) more than he can." Specifies that one should do what he can to support the community, but since everyone has different levels of ability, it cannot be expected that all will perform the same.⏎