Though all manner of fraud and tricking is mean, and utterly beneath a
man of sense and honour, yet, methinks, equity itself allows us to
disappoint the deceiver, and to repel craft by cunning. Treachery has
something so wicked and worthy of punishment in its nature, that it
deserves to meet with a return of its own kind: an open revenge would be
too liberal for it, and nothing matches it but itself. However,
therefore, abominable it is to be the aggressor in this point, yet it
cannot be inconsistent with virtue to counterplot and to take all manner
of advantage against the man who is undermining us.