To the reader who employs his leisure ill  

From Robert Burton's The Anatomy of Melancholy:

Whoever you are, I warn you not to insult the Author of this work, or to cavil and mock at him. Nay, do not silently condemn him (to speak in a word) because of the censure of others, nor ineptly and sarcastically disapprove of him, nor make up false tales about him. For if Democritus Junior is really what he professes to be, at least akin to the older Democritus, or smack ever so little of his genius, it is all up with you, he will act the part of your censor and accuser, being of petulent spleen, will inundate you with jokes, crush you with witticisms, and sacrifice you, I may add, to the God of Laughter.

I again warn you not to cavil at all, lest, (while you defame Democritus Junior, who has no animosity against you, with your railing, or disgracefully disparage him,) you should hear from some sagacious friend the very word that the people of Abdera of old heard from Hippocrates, when they accounted their well-deserving and popular fellow-townsman Democritus a madman. "You, Democritus, are wise, it is the people of Abdera that are foolish and mad." You have the heart of the people of Abdera. Having warned you thus in a few words, O Reader who employ your leisure ill, good-bye.