Brain Pickings writes the following:
Style is the physiognomy of the mind. It is a more reliable key to character than the physiognomy of the body. To imitate another person’s style is like wearing a mask. However fine the mask, it soon becomes insipid and intolerable because it is without life; so that even the ugliest living face is better.
He issues an especially eloquent admonition against intellectual posturing in writing:
There is nothing an author should guard against more than the apparent endeavor to show more intellect than he has; because this rouses the suspicion in the reader that he has very little, since a man always affects something, be its nature what it may, that he does not really possess. And this is why it is praise to an author to call him naïve, for it signifies that he may show himself as he is. In general, naïveté attracts, while anything that is unnatural everywhere repels. We also find that every true thinker endeavors to express his thoughts as purely, clearly, definitely, and concisely as ever possible. This is why simplicity has always been looked upon as a token, not only of truth, but also of genius. Style receives its beauty from the thought expressed, while with those writers who only pretend to think it is their thoughts that are said to be fine because of their style. Style is merely the silhouette of thought; and to write in a vague or bad style means a stupid or confused mind.
If a man has something to say that is worth saying, he need not envelop it in affected expressions, involved phrases, and enigmatical innuendoes; but he may rest assured that by expressing himself in a simple, clear, and naïve manner he will not fail to produce the right effect. A man who makes use of such artifices as have been alluded to betrays his poverty of ideas, mind, and knowledge.
Obscurity and vagueness of expression are at all times and everywhere a very bad sign. In ninety-nine cases out of a hundred they arise from vagueness of thought, which, in its turn, is almost always fundamentally discordant, inconsistent, and therefore wrong. When a right thought springs up in the mind it strives after clearness of expression, and it soon attains it, for clear thought easily finds its appropriate expression. A man who is capable of thinking can express himself at all times in clear, comprehensible, and unambiguous words. Those writers who construct difficult, obscure, involved, and ambiguous phrases most certainly do not rightly know what it is they wish to say: they have only a dull consciousness of it, which is still struggling to put itself into thought; they also often wish to conceal from themselves and other people that in reality they have nothing to say.