From the fact that Smith thus endeavored to make the phone ring, it does not follow that phone actually rang. Maybe it was off the hook. Thus endeavor has a certain intentional aspect. Furthermore, assume that the telephone in Los Angeles is in fact the only purple phone in the Area Code. Even if Smith dialed in the endeavor to make that phone ring, it does not follow that he dialed in the endeavor to make the only purple phone in the Area Code ring. Maybe Smith didn’t know the color of the phone; maybe he didn’t care about making purple phones ring. So the concept of endeavor has a further intentional feature.