Theodorus the Atheist
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Theodorus the Atheist from Cyrene lived around 300 b.c.e. He was banished from Cyrene in his early years, and moved to Athens to become a follower of the younger Aristippus. He also managed to get himself banished from Athens which caused him to go into the service of Ptolemy in Alexandria. It was in this service that he was sent as an ambassador to Lysimachus, who became offended by Theodorus' free speech as a lack of respect and decorum.
Theodorus taught that the aim of human life was to obtain joy and avoid grief, and that joy comes through prudence while grief arises from folly. Prudence and justice represented good, their opposites evil. Laertius complained that Theodorus "did away with all opinions respecting the Gods," but he may have just rejected the notions of deity popular in his time.