“Among most Christians the Old Testament is little read in comparison to the New Testament. Furthermore, much of what is read is often distorted by prejudice. Frequently the Old Testament is believed to express exclusively the principles of justice and revenge, in contrast to the New Testament, which represents those of love and mercy; even the sentence, "Love your neighbor as yourself,” is thought by many to derive from the New, not the Old Testament. Or the Old Testament is believed to have been written exclusively in the spirit of narrow nationalism and to contain nothing of supranational universalism so characteristic of the New Testament.”
You Shall Be as Gods: A Radical Interpretation of the Old Testament and Its Tradition (1966) "Introduction"
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Erich Fromm 119
German social psychologist and psychoanalyst 1900–1980Related quotes

“The Old and New Testaments are the great code of art.”
Oldest source found: "The Harvard Advocate" (Vol. 102–103), p. 268
Attributed

“Aristocracy is the spirit of the Old Testament, democracy of the New.”
Napoleon : In His Own Words (1916)

“The God of the New Testament is not a different God from the God of the Old”
Sermon 1
Context: In the Gospel of the New Testament the ancient conception of God is perfected and fulfilled... The same God who spoke from the bush on Mount Horeb had now appeared visibly in the Person of Emmanuel, God with us... The God of the New Testament is not a different God from the God of the Old.

Nothing Created Everything: The Scientific Impossibility of Atheistic Evolution (2009)

“Prosperity is the blessing of the Old Testament; adversity is the blessing of the New.”
Of Adversity
Essays (1625)

But in this text postponed in a far wider concept than Malevich meant his Suprematism
1915 - 1925, Suprematism' in World Reconstruction (1920)

“I am the blank page between the Old Testament and the New.”
Cited in Herbert Henry Asquith, Letters of the Earl of Oxford and Asquith to a Friend, Vol. 2 (1933), p. 94.
Sourced but undated
Context: Miss Sands told me that Queen Victoria, who was latterly éprise with Disraeli, one day asked him what was his real religion. "Madam," he replied, "I am the blank page between the Old Testament and the New."

Source: The Writing of Thomas Paine

“But all Scripture is divided into two Testaments. That which preceded the advent and passion of Christ—that is, the law and the prophets—is called the Old; but those things which were written after His resurrection are named the New Testament. The Jews make use of the Old, we of the New.”
Verum Scriptura omnis in duo Testamenta diuisa est. Illud quod aduentum passionemque Christi antecessit, id est lex et prophetae, Vetus dicitur; ea uero quae post resurrectionem eius scripta sunt, Nouum Testamentum nominantur. Iudaei Veteri utuntur, nos nouo.
Book IV, Chap. XX
The Divine Institutes (c. 303–13)