It is rare for discourse just to serve only one function

It is rare for discourse just to serve only one function; even in a scientific treatise, discursive (logical) clarity is required, but, at the same time, ease of expression often demands some presentation of attitude or feeling—otherwise the work might be dull.

in: Philosophy 103: Introduction to Logic > Common Forms and Functions of Language
Lander University
Greenwood, SC
http://philosophy.lander.edu/logic/form_lang.html

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