Written words remain — a written contract cannot be varied by parol proof.

Explanation

Once parties reduce their agreement to writing, the writing is the contract — prior oral negotiations merge into the instrument and cannot contradict it.

Where this applies

• We have a signed contract but my partner says we verbally agreed to different terms.
• The written agreement says one thing but the other party claims we discussed something else before signing.

See also

• 6.3.3 Words of mouth are to be received with practical effect — where words and intent agree, no interpretation is needed.