“ Empedocles held that the material world is a sphere; that in the Golden Age Strife was outside and Love inside; then, gradually. Strife entered and Love was expelled, until, at the worst, Strife will be wholly within and Love wholly without the sphere. ”
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

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“There are Ionian, and in more recent time Sicilian, muses, who have arrived at the conclusion that to unite the two principles (of the One and the Many) , is safer, and to say that being is one and many, and that these are held together by enmity and friendship, ever parting, ever meeting, as the severer Muses assert, while the gentler ones do not insist on the perpetual strife and peace, but admit a relaxation and alternation of them; peace and unity sometimes prevailing under the sway of Aphrodite, and then again plurality and war, by reason of a principle of strife.
Empedocles held that the material world is a sphere; that in the Golden Age Strife was outside and Love inside; then, gradually. Strife entered and Love was expelled, until, at the worst, Strife will be wholly within and Love wholly without the sphere. Then—though for what reason is not clear—an opposite movement begins, until the Golden Age returns, but not for ever. The whole cycle is then repeated. One might have supposed that either extreme could be stable, but that is not the view of Empedocles.” source