Philippic 1
Demosthenes
Demosthenes. Vol. I. Olynthiacs, Philippics, Minor Public Speeches, Speech Against Leptines, I-XVII, XX. Vince, J. H., translator. Cambridge, MA: Harvard University Press, 1930 (printing).
That, even if you should not act as I, personally, think you ought, is not an altogether trivial matter; for its purpose is that he may either hold his hand through fear, knowing that you are on the alert—he will know it sure enough, for there are some on our side, yes, too many, who report everything to him—or that he may overlook it and so be taken off his guard, provided there is nothing to hinder you from sailing against his country, if he gives you the chance.