The expression of things of which, if unexpressed, one would have the benefit, is useless.

Explanation

(English-origin maxim.) Expressing what the law would already imply is mere surplusage — it adds nothing and changes nothing, because the implied right or condition already exists by operation of law.

Where this applies

• A lease explicitly states the tenant has the right to "quiet enjoyment" of the premises — but the law already implies that right in every lease, so writing it out changes nothing.
• A contract spells out that both parties must act in good faith — the law already requires good faith in every contract, so the clause is surplusage.
• A deed explicitly grants the buyer the right to exclude trespassers from the property — but ownership already includes that right by operation of law, making the express grant unnecessary.