"..and my first direction is, that if you will Fish for a Carp, you must put on a very large measure of patience; especially to fish for a River Carp: I have known a very good Fisher angle diligently four or six hours in a day, for three or four daies together for a River Carp, and not have a bite: and you are to note, that in some ponds it is as hard to catch a Carp as in a River; that is to say, where they have store of feed, and the water is of a clayish colour: But you are to remember, that I have told you there is no rule without an exception, and therefore being possest with that hope and patience which I wish to all Fishers, especially to the Carp-Angler.." -Izaak Walton