It seems to me that in this whole doctrine about mental disturbances, one thing sums up the matter: that they are all in our power, that they are all taken on as a matter of judgment, that they are all voluntary. This error, then, must be uprooted, this opinion stripped away; and just as things must be made tolerable in circumstances we regard as evil, so too in good ones, those things thought to be great and delightful should be taken more calmly. Cicero, Tusculan Disputations 4.31
