Quintus Curtius Rufus, History of Alexander 8.9.33

8.9.33

Illi, qui in urbibus publicis muneribus degunt, siderum motus scite spectare dicuntur et futura praedicere.

Amid this corruption of morals who would expect to find the culture of philosophy? Notwithstanding, they have men whom they call philosophers, of whom one class lives in the woods and fields, and is extremely uncouth. These think it glorious to anticipate the hour of destiny, and arrange to have themselves burned alive when age has destroyed their activity, or the failure of health has made life burdensome. They regard death if waited for as a disgrace to their life, and when dissolution is simply the effect of old age funeral honours are denied to the dead body. They think that the fire is polluted unless the pyre receives the body before the breath has yet left it. Those philosophers again who lead a civilised life in cities are said to observe the motions of the heavenly bodies, and to predict future events on scientific principles. These believe that no one accelerates the day of his death who can without fear await its coming.