rks
of Democritus while he resided at Colophon. From thence he went to
Mitylene and Lampsacus, and B.C. 306 he returned to Athens, and finally
established himself as a teacher of philosophy. His own life was that of a
man of simple, pure, and temperate habits. He died of the stone, B.C. 270,
and left Hermarchus of Mitylene as his successor in the management of his
school.

None of his works have come down to us. With regard to his philosophical
system, in spite of his boast of being self-taught and having borrowed
from no one, he clearly derived the chief part of his natural philosophy
from Democritus, and of his moral philosophy from Aristippus and the
Cyrenaics. He considered human happiness the end of all philosophy, and
agreed with the Cyrenaics that pleasure constituted the greatest
happiness; still this theory in his hands acquired a far loftier
character; for pleasure, in his idea, was not a mere momentary and
transitory sensation, but something lasting and imperishable, consisting
in pure mental enjoyments, and in the freedom from pain and any other
influence which could disturb man's peace of mind. And the _summum bonum_,
according to him, consisted in this peace of mind; which was based upon
correct wisdom ({~GREEK SMALL LETTER PHI~}{~GREEK SMALL LETTER RHO~}{~GREEK SMALL LETTER OMICRON WITH OXIA~}{~GREEK SMALL LETTER NU~}{~GREEK SMALL LETTER ETA~}{~GREEK SMALL LETTER SIGMA~}{~GREEK SMALL LETTER IOTA~}{~GREEK SMALL LETTER FINAL SIGMA~}).

In his natural philosophy he embraced the atomic theories of Democritus
and Diagoras, carrying them even further than they themselves had done, to
such a degree that he drew upon himself the reproach of Atheism. He
regarded the Gods themselves as consisting of atoms, and our notions of
them as based upon the images ({~GREEK SMALL LETTER EPSILON~}{~GREEK SMALL LETTER IOTA WITH PSILI AND OXIA~}{~GREEK SMALL LETTER DELTA~}{~GREEK SMALL LETTER OMEGA~}{~GREEK SMALL LETTER LAMDA~}{~GREEK SMALL LETTER ALPHA~}) which are reflected from them, and
so pass into our minds. And he believed that they exercised no influence
whatever on the world, or on the actions or fortunes of man.

_Theodorus_ was a native of Cyrene, who flourished about B.C. 320. He was
of the Cyrenaic sect, and the founder of that branch of it which was
called after him, the Theodorean; though we scarcely know in what his
doctrines differed from those of Aristippus, unless they were, if
possible, of a still more lax chara