“The aspect of language use that is most worth changing is the clarity and style of written prose. The human language faculty was not designed for putting esoteric thoughts on paper for the benefit of strangers, and this makes writing a difficult craft that must be mastered through practice, feedback and intensive exposure to good examples. There are excellent manuals of composition that discuss these skills with great wisdom—but note how their advice concentrates on important practical tips like “omit needless words” and “revise extensively,” not on the trivia of split infinitives and slang.”—Steven Pinker
http://www.newrepublic.com/article/77732/grammar-puss-steven-pinker-language-william-safire