“The two feelings, envy and arrogance, are but opposite sides of the same shield, but different developments of the same spirit.”
1900s, A Square Deal (1903)
Context: The average American knows not only that he himself intends to do what is right, but that his average fellow countryman has the same intention and the same power to make his intention effective. He knows, whether he be business man, professional man, farmer, mechanic, employer, or wage-worker, that the welfare of each of these men is bound up with the welfare of all the others; that each is neighbor to the other, is actuated by the same hopes and fears, has fundamentally the same ideals, and that all alike have much the same virtues and the same faults. Our average fellow citizen is a sane and healthy man who believes in decency and has a wholesome mind. He therefore feels an equal scorn alike for the man of wealth guilty of the mean and base spirit of [arrogance]] toward those who are less well off, and for the man of small means who in his turn either feels, or seeks to excite in others the feeling of mean and base envy for those who are better off. The two feelings, envy and arrogance, are but opposite sides of the same shield, but different developments of the same spirit.
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Theodore Roosevelt 445
American politician, 26th president of the United States 1858–1919Related quotes

“Devil and God are two sides of the same face.”
“The Devil and God,” p. 20
The Creator (2000), Sequence: “The Light-Bearer”

1 Corinthians 12:4-11 https://www.biblegateway.com/passage/?search=1+Corinthians+12&version=KJV;SBLGNT<!-- also quoted in An Essay for the Understanding of St. Paul's Epistles https://books.google.com/books?id=13VHAQAAMAAJ by John Locke (1812 edition) pp.165-166 -->
First Epistle to the Corinthians
Context: Now there are diversities of gifts, but the same Spirit.
And there are differences of administrations, but the same Lord.
And there are diversities of operations, but it is the same God which worketh all in all.
But the manifestation of the Spirit is given to every man, to profit withal.
For to one is given, by the Spirit, the word of wisdom; to another the word of knowledge, by the same Spirit;
To another, faith by the same Spirit; to another, the gifts of healing, by the same Spirit;
To another, the working of miracles; to another, prophecy; to another, discerning of spirits; to another, divers kinds of tongues; to another, the interpretation of tongues.
But all these worketh that one and the self-same Spirit, dividing to every man severally, as he will.

“The German Reunification and unification of Europe are two sides of the same coin.”
Die deutsche Einheit und die europäische Einigung sind zwei Seiten ein und derselben Medaille.
In a speech on the 15th party congress of the CDU, in Frankfurt an Main (June 17, 2002)

Aphorism (1937), p. 38
Attributed in posthumous publications, Albert Einstein: The Human Side (1979)
Context: Body and soul are not two different things, but only two different ways of perceiving the same thing. Similarly, physics and psychology are only different attempts to link our experiences together by way of systematic thought.

Quote of Naum Gabo (1957), as cited in: Gabo: Construction, Sculpture, Paintings, Drawings, Engravings. p. 164.
1936 - 1977

Day of Affirmation Address (1966)
Context: All do not develop in the same manner, or at the same pace. Nations, like men, often march to the beat of different drummers, and the precise solutions of the United States can neither be dictated nor transplanted to others. What is important is that all nations must march toward increasing freedom; toward justice for all; toward a society strong and flexible enough to meet the demands of all its own people, and a world of immense and dizzying change.

1960's
undated quotes
Source: Warhol in his own words – Untitled Statements ( 1963 – 1987), selected by Neil Printz; as quoted in Andy Warhol, retrospective, Art and Bullfinch Press / Little Brown, 1989, pp. 457 – 467