 As the rules of logic operate on linguistic objects, and these linguistic objects may be considered separately from the precise mathematical context in which they described a truth, it is possible to apply the rules of logic and obtain new linguistic objects without providing a precise mathematical context for the latter. In other words, the logical principles, which can be stated without specifying the context in which they are applied, and thereby suggest context-independence, are for their correctness sensitive to the context. There is no general guarantee that logical principles which are valid in one context, will be equally valid in a different one. This is what Brouwer means when he speaks of “the unreliability of the logical principles”, the title and theme of his seminal paper Brouwer 1908C; see also Brouwer 1949A: 1243.