XI. Such were the main sources of the Athenian revenue. Opportunities will occur to fill up the brief outline and amplify each detail. This sketch is now presented to the reader as comprising a knowledge necessary to a clear insight into the policy of Pericles. A rapid glance over the preceding pages will suffice to show that it was on a rigid avoidance of all unnecessary war--above all, of distant and perilous enterprises, that the revenue of Athens rested. Her commercial duties--her tax on settlers--the harvest of judicial fees, obtained from the dependant allies--the chief profits from the mines-- all rested upon the maintenance of peace: even the foreign tribute, the most productive of the Athenian resources, might fail at once, if the Athenian arms should sustain a single reverse, as indeed it did after the fatal battle of Aegospotamos [283]. This it was which might have shown to the great finance minister that peace with the Peloponnesus could scarce be too dearly purchased [284]. The surrender of a few towns and fortresses was nothing in comparison with the arrest and paralysis of all the springs of her wealth, which would be the necessary result of a long war upon her own soil. For this reason Pericles strenuously checked all the wild schemes of the Athenians for extended empire. Yet dazzled with the glories of Cimon, some entertained the hopes of recovering Egypt, some agitated the invasion of the Persian coasts; the fair and fatal Sicily already aroused the cupidity and ambition of others; and the vain enthusiasts of the Agora even dreamed of making that island the base and centre of a new and vast dominion, including Carthage on one hand and Etruria on the other [285]. Such schemes it was the great object of Pericles to oppose. He was not less ambitious for the greatness of Athens than the most daring of these visionaries; but he better understood on what foundations it should be built. His objects were to strengthen the possessions already acquired, to confine the Athenian energies within the frontiers of Greece, and to curb, as might better be done by peace than war, the Peloponnesian forces to their own rocky barriers. The means by which he sought to attain these objects were, 1st, by a maritime force; 2dly, by that inert and silent power which springs as it were from the moral dignity and renown of a nation; whatever, in this latter respect, could make Athens illustrious, made Athens formidable.