 The thought, presumably, is that it is futile, because what you do will have no effect. If so, the reply given by Chrysippus (c280–c206 B.C.E.) to this argument seems exactly right (Bobzien 1998, 5.2). The conclusion does not follow, because it may have been fated that you will recover as a result of seeing the doctor. The corresponding reply would be equally apt if we substituted “necessary” for “fated”.