The simple approach is to claim that theories must always depend on logical analytic thinking. However, I seems to me that in my subject of macroeconomics this is not necessarly true. The macroeconomics twin axioms of Henry George are most pertinant there. "Mankind seeks to satisfy his/her desires with the least exertion." Yet "Mankind's desires are unlimited". These are opposite trends, but which must apply simultaneously. So it becomes logical to be illogical too!