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> The purpose of language is communication

It isn't this simple. Literacy plays an important role in information assessment and in decision making. It's strongly associated with health, success in personal finances and career path, and relationship satisfaction, to name just a few areas that have published papers readily accessible online.

To get a look at the ugly side of this, high demand religious groups are a fascinating case study. Constant circulation of repetitive cliches is a key mechanism for isolating their members and making them easier to manipulate.