No cause of action arises from a bare promise.

It is fraud to conceal fraud.

A public right cannot be changed by private agreement.

Every innovation occasions more harm and and derangement of order by its novelty, than benefit by its abstract utility.

He who spares the guilty threatens the innocent.

The trodden path is the safest.

That which necessity compels she excuses.

The laws are adapted to those cases which most frequently occur.

Every skilled person is to be believed with reference to his own art.