During the deep sleep of the interval (circa A.D. 375-675) which, intervened between the break-up of the Roman Empire and the gradual emergence of ou… - Arnold J. Toynbee

Compassion is the desire that moves the individual self to widen the scope of its self-concern to embrace the whole of the universal self.

So far all is plain, but further search brings us up against complications. The first is that the predecessor of the Islamic society (not yet identified) proves to be the parent not of a single offspring but of twins, in this respect resembling the parental achievement of the Hellenic society. The conduct of the pairs of twins has been, however, strikingly dissimilar; for, whereas the Western and the Orthodox Society have survived for over a thousand years side by side, one of the offspring of the parent society which we are seeking to identify swallowed up and incorporated the other. We shall call these twin societies the Iranic and the Arabic.

On this showing, the nature of the breakdowns of civilizations can be summed up in three points: a failure of creative power in the minority, an answering withdrawal of mimesis on the part of the majority, and a consequent loss of social unity in the society as a whole.