And why word usage that reflects understanding of the words used, or proper spelling and punctuation?
Neither can his mind be thought to be in tune, whose words do jar;
Nor his reason in frame, whose sentence is preposterous;
Nor his elocution clear and perfect,
Whose utterance breaks itself into fragments and uncertainties.
– Ben Johnson, Discoveries, 1641
Well-written prose is a reflection of clear thought. It’s just that simple.
Of course, the quote above is in very slightly updated orthography. Johnson actually wrote–quite readably for person who’s literate in English,
Neither can his mind be thought to be in tune, whose words doe jarre;
Nor his reason in frame, whose sentence is preposterous;
Nor his Elocution cleare and perfect,
Whose utterance breakes it selfe into fragments and uncertainties.– Ben Jonson, Discoveries, 1641