There was only one catch and that was Catch-22, which specified that a concern for one's safety in the face of dangers that were real and immediate was the process of a rational mind. Orr was crazy and could be grounded. All he had to do was ask; and as soon as he did, he would no longer be crazy and would have to fly more missions. Orr would be crazy to fly more missions and sane if he didn't, but if he was sane he had to fly them. If he flew them he was crazy and didn't have to; but if he didn't want to he was sane and had to. Yossarian was moved very deeply by the absolute simplicity of this clause of Catch-22 and let out a respectful whistle. "That's some catch, that Catch-22," he observed. "It's the best there is," Doc Daneeka agreed.
A politician will always tip off his true belief by stating the opposite at the beginning of the sentence. For maximum comprehension, do not start listening until the first clause is concluded. Begin instead at the word "but" which begins the second, or active, clause. This is the way to tell a liberal from a conservative -- before they tell you. Thus: "I have always believed in a strong national defense, second to none, but ... " (a liberal, about to propose a $20 billion defense cut).