“An imbalance between rich and poor is the oldest and most fatal ailment of all republics.”
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Plutarch 251
ancient Greek historian and philosopher 46–127Related quotes

Speech at Edinburgh (24 November 1882), from in G. Cecil, The Life of Robert, Marquis of Salisbury. Volume III, p. 65
1880s

The Writings of Marguerite Bourgeoys, p. 201

Definitions

Interview http://www.rationalrevolution.net/special/library/cc835_44.htm with H. G. Wells (September 1937)
Stalin's speeches, writings and authorised interviews
Variant: Which means Mankind is divided into rich and poor, into property owners and exploited; and to abstract oneself from this fundamental division; and from the antagonism between poor and rich means abstracting oneself from fundamental facts.

1960s, The Quest for Peace and Justice (1964)

“Every man is rich or poor according to the proportion between his desires and his enjoyments”
No. 163 (8 October 1751)
The Rambler (1750–1752)
Context: Every man is rich or poor according to the proportion between his desires and his enjoyments; any enlargement of wishes is therefore equally destructive to happiness with the diminution of possession, and he that teaches another to long for what he never shall obtain is no less an enemy to his quiet than if he had robbed him of part of his patrimony.
The Sixth Night.
The White Tiger (2008)

"National Brotherhood Week"
That Was the Year That Was (1965)