“With the increase of wealth the mania of covetousness increases.”
Book VII Chapter VII
Institutes of the Coenobia (c. 420 AD)
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John Cassian 7
Christian monk and theologian 360–435Related quotes

Source: "Evolutionary Socialism" (1899) https://www.marxists.org/reference/archive/bernstein/works/1899/evsoc/index.htm, Chapter II, The Economic Development of Modern Society
Oscar Iden Lecture Series, Lecture 3: "The State of Individuals" (1976)

“[…]proper mental exercise increases your chances for wealth.”
Rich Dad Poor Dad: What the Rich Teach Their Kids About Money-That the Poor and the Middle Class Do Not!

1960s, Operating Manual for Spaceship Earth (1963)

Source: (1776), Book I, Chapter VIII, p. 97.
Source: The Political Economy of International Relations (1987), Chapter Three, Dynamics Of Political Economy, p. 100