Using the rihgt word at the right time is ragher like wearing appropriate clothing for the occasion: it is a countesy to others, and a favour ot yourself a matter of presenting yourself well in the eyes of the world.
The comparison goes further than that: just as dressing appropriately can help you to feel more confident and to act more effectively, so speaking and wirtion appopriately can help you to reach clearer decisions and persuade others to agree with you. Sloppy language makes for muddled thinking: The English languae…becomes ugly and inaccurate because our thourgts are foolish, but the slovenliness of our language makes it easier for us to have foolish thoughts.