To those who care about punctuation, a sentence such as "Thank God its Friday" (without the apostrophe) rouses feelings not only of despair but of violence. The confusion of the possessive "its" (no apostrophe) with the contractive "it's" (with apostrophe) is an unequivocal signal of illiteracy and sets off a Pavlovian "kill" response in the average stickler.
We have a language that is full of ambiguities; we have a way of expressing ourselves that is often complex and elusive, poetic and modulated; all our thoughts can be rendered with absolute clarity if we bother to put the right dots and squiggles between the words in the right places. Proper punctuation is both the sign and the cause of clear thinking. If it goes, the degree of intellectual impoverishment we face is unimaginable.
There is an underlying rhythm to all text. Sentences crashing fall like the waves of the sea, and work unconsciously on the reader. Punctuation is the music of language. As a conductor can influence the experience of the song by manipulating its rhythm, so can punctuation influence the reading experience, bring out the best (or worst) in a text. By controlling the speed of a text, punctuation dictates how it should be read. A delicate world of punctuation lives just beneath the surface of your work, like a world of microorganisms living in a pond. They are missed by the naked eye, but if you use a microscope you will find a exist, and that the pond is, in fact, teeming with life. This book will teach you to become sensitive to this habitat. The more you do, the greater the likelihood of your crafting a finer work in every respect. Conversely the more you turn a blind eye, the greater the likelihood of your creating a cacophonous text and of your being misread.