Usage patterns
原則を守るto abide by a principle
At this company, all employees abide by that principle.
原則に従うto follow a principle
Contracts are made in accordance with the principles of a market economy.
原則を適用するto apply a principle
The judge applied the same principle to this case as well.
原則を貫くto stick firmly to a principle
He held firmly to his principles no matter the situation.
Expressions
信頼の原則principle of reliance; rule of reliance on reasonable conduct