I enjoyed reading Steven Pinker's Sense of Style. With its analytical approach to writing style, it helped me significantly improve mine. For example, he argues

I enjoyed reading Steven Pinker's Sense of Style. With its analytical approach to writing style, it helped me significantly improve mine. For example, he argues a reader should not be made to use a large stack when parsing your sentences. Another great book that came out in 2014, and I couldn't recommend enough, is Sam Harris's Waking Up. As a neuroscientist and renowned atheist, he explores the possibility of adopting a certain spiritual attitude (i.e. mindfulness) without believing in a religion or having to have faith.