Those who speak to the crowd, coveting its approval, those who deferentially bow and scrape before it must be regarded as being worse than prostitutes. They are instruments of untruth.

Full essay: http://oregonstate.edu/instruct/phl201/modules/Philosophers/Kierkegaard/kierkegaard_the_crowd_is_untruth.html

A summary of some of Kierkegaard's best writings: http://www.ldolphin.org/Provocations.pdf