"The objection, that a contract is immoral or illegal as between plaintiff and defendant, sounds at all times very ill in the mouth of the defendant. It is not for his sake, however, that the objection is ever allowed; but is founded on general principles of policy, which the defendant has the advantage of, contrary to the real justice, as between him and the plaintiff, by accident, if I may say so. The principle of public policy is this; ex dolo malo non oritur actio. No Court will lend its aid to a man who founds his cause of action upon an immoral or an illegal act. If, from the plaintiff’s own stating or otherwise, the cause of action appears to arise ex turpi causa or the transgression of a positive law of this country, there the Court says he has no right to be assisted."