Construction is referred to the principles of a thing.
Constructio est secundum æquitatem.
Construction is according to equity.
Constructio legis non facit injuriam.
The construction of law does not occasion injury.
Constructio secundum æqualitatem rationis.
Construction is according to the equality of reason.
Consuetudo alicujus loci lex est legis loci; legi communi specie diversa sed non in genere contraria.
The custom of any place is the law of that place; different in species to common law, but not contrary in kind.
Consuetudo, contra rationem introducta, potius usurpatio quam consuetudo appellari debet.