168. It must be known besides that the end is the everything in the cause and the everything, too, in the effect. Hence it is that end, cause and effect are called first, middle and last end. But for the end to be everything in the cause, there must be something from the end in the cause wherein it must be. But so that the end may be everything in the effect, there must be something out of the end through the cause wherein the end must be. For the end cannot be in itself alone, but must be in something existing from it, in which it can indwell as to its entirety, and by acting, be effective even until it has a permanent existence. That in which it permanently exists is the last end, and this is called the effect.