Preface
Spinoza's Critique of Religion (1965)
“The print-made split between head and heart is the trauma which affects Europe from Machiavelli till the present.”
Source: 1960s, The Gutenberg Galaxy (1962), p. 193
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Marshall McLuhan 416
Canadian educator, philosopher, and scholar-- a professor … 1911–1980Related quotes
““You split hairs.”
“Better to split hairs than the heads beneath them.””
Source: Eifelheim (2006), Chapter XXV (p. 447)

As quoted in "Mevlana Jalal al-Din Rumi" http://en.mfethullahgulen.com/content/view/1820/49/ by Fethullah Gülen in The Fountain #24 (July-September 2004)
Variant translation: I want a heart which is split, chamber by chamber, by the pain of separation from God, so that I might explain my longings and desires to it.

"Apology for Printers" (1730); later in Benjamin Franklin's Autobiographical Writings (1945) edited by Carl Van Doren
1730s

Quotes from secondary sources, Smooth Stones Taken From Ancient Brooks, 1860

“I have written with a very confused head from the affects of laudanum.”
Letter to Sir James Mackintosh in 1813, excusing a brief letter he had sent him, quoted in Patrick O'Leary, Sir James Mackintosh. The Whig Cicero (Aberdeen University Press, 1989), p. 184.
1810s

“Thou hast made us for Thyself, and the heart never resteth till it findeth rest in Thee.”
Source: Dictionary of Burning Words of Brilliant Writers (1895), p. 515