Lord Ickenham sighed. In principle he approved of his young friend's rigid code of ethics, but there was no denying that that high-mindedness of his could be inconvenient, lowering as it did his efficiency as a plotter. The ideal person with whom to plot is the furtive, shifty-eyed man who stifled his conscience at the age of six and would not recognize a scruple if you served it up to him on an individual blue plate with bearnaise sauce.
(from Service with a Smile, by Sir Pelham Wodehouse)
More HERE about plotters.