The binding legal principles established are: (1) Where the plain language of a contract, understood in its textual and structural context, does not require consent for a particular action, a court cannot import such a requirement based on the parties' past conduct or on principles of good faith or fairness. (2) Good faith in South African contract law is not an independent, free-standing source of contractual obligations that can be used to alter, add to or vary the terms parties have agreed to; rather, good faith is an underlying principle that informs the substantive rules of contract law. (3) Courts cannot use good faith, justice or fairness as abstract principles to impose contractual duties that the parties did not agree to or to decline to enforce bargains freely entered into. (4) While extrinsic evidence of the parties' post-contractual conduct may be admissible as relevant to context for purposes of interpretation (following University of Johannesburg), such evidence must be weighed and cannot displace the clear meaning derived from the text, structure and purpose of the agreement where that evidence is equivocal. (5) The parol evidence rule, while somewhat residual in its operation under the current approach to interpretation, still operates to exclude evidence that contradicts, adds to or varies a written contract once the meaning of that contract has been properly determined through consideration of text, context and purpose. (6) The interpretation of contracts must commence with the text and its structure - context and purpose are used to elucidate the text, not to import meanings unmoored from the text. (7) Where parties have structured their agreement to differentiate the treatment of different categories of persons (e.g. by imposing prohibitions on some but merely consequences on others), courts should respect those distinctions in interpretation.