>>23
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How is talking depends on "infinity"?
Any talking consist of communication, and communication usually involves the expression and interpretation of ideas. Infinity is an idea. There are many ideas that can be further understood and explored by making explicit use of the idea of infinity. Not every idea has dependence on infinity. But what would stop you from applying it when it becomes appropriate? And even then, why wouldn't you expand an idea, even if it didn't appear to be appropriate or useful? It can be enjoyable to think about these things, even if they don't lead you anywhere. That fact that the thought occurred to you makes it appropriate.