Fowler’s Modern English Usage, ed. by R. W. Burchfield

Many editors and writers pick up this 1926 primer when in the mood for some grammatical reinforcement: “The English-speaking world may be divided into (1) those who neither know nor care what a split infinitive is; (2) those who do not know, but care very much; (3) those who know and condemn; (4) those who know and approve; and (5) those who know and distinguish. [But] those who neither know nor care are the vast majority, and are a happy folk, to be envied by the minority classes.” Drollery aside, Fowler provides timeless principles for stripping away artificiality and stuffiness in prose.