Such being, in brief, the process of the building up of culture for Greece, it remains to note the causes of the process of retrogression, which also connects broadly with the course of politics. Indeed, the mere expansion of Hellenistic life set up by the empire-making of Alexander might alone account for a complete change in the conditions and phases of Greek civilisation. In the new Hellenistic world wealth and power were to be won with ease and with amenity[345] where of old there was only an alien barbarism, or at least a society which to the cultured Greek was barbaric. When such cities as Alexandria and Antioch beckoned the Greek scholar of small means, impoverished Athens could hardly retain him. Her extorted revenue in her most powerful period,[346] as we saw, was the source of her highest flight of artistic splendour; and even after the Peloponnesian War, with greatly lessened power, Athens was the most desirable dwelling-place in Hellas. After Alexander, all this was insensibly changed: Athens, though for a time filled with Greeks enriched by the plunder of Persia, must needs gradually dwindle to the point at which the slight natural advantages of her soil, industry, and situation would maintain her; and the life of ideas, such as it finally was, passed inevitably to Alexandria, where it was systematically encouraged and protected, in the fashion in which well-meaning autocrats do such things. But while these new developments were not inconsiderable, and included some rare felicities, they were on the whole fatally inferior to the old, and this for reasons which would equally affect what intellectual life was left in Greece proper.