 This reasons-responsiveness is what distinguishes us from other animals and allows us to control our own development, while other animals cannot. Other animals have in-born temperaments: for instance, lions are naturally irascible because their minds contain many fire atoms, while stags are timid because they have more wind atoms (DRN 3.288–306). People also have natural temperaments: some are easily moved to anger, while others are too fearful (DRN 3.307–318). But we can use our reason to expel any harmful dispositions, so that only trivial traces of these temperaments remain, and we are able to achieve a life worthy of the gods (DRN 3.319–322).