Optimus legum interpres consuetudo.
Custom is the best interpreter of laws.
P.
Pacta dant legem contractui.
Bargains give a law to contract.
Pacta privata juri publico derogare non possunt.
Private bargains cannot derogate from public right.
Pacta quæ contra leges constitutionesque vel contra bonos mores fiunt, nullam vim habere indubitati juris est.
It is a part of established law, that bargains have no force which are made against laws, and constituted authorities are against good manners.
Pacta reciproca vel utrosque ligant vel neutrum.