“unconcerned but not indifferent”
His epitaph, chosen by his widow, Juliet Browner Man Ray, because they were words he'd often said of himself. Quoted in "Man Ray : Master of Imagery; Pioneer Artist and Photographer" by Max Perchick , in PSA Journal (1 May 1991) http://www.encyclopedia.com/doc/1G1-10728732.html
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Man Ray 18
American artist and photographer 1890–1976Related quotes

February 7, 1754 (Letter to Lord Chesterfield)
Life of Samuel Johnson (1791), Vol I

“Indifference of every kind is reprehensible, even indifference towards one’s self.”
Source: Aphorisms (1880/1893), p. 82.

US News & World Report (27 October 1986)

Source: Sanitary Economy (1850), p. 17

"On Relativism" (1925)
Context: Socialism is good when it comes to wages, but it tells me nothing when it comes to other questions in life that are more private and painful, for which I must seek answers elsewhere. Relativism is not indifference; on the contrary, passionate indifference is necessary in order for you not to hear the voices that oppose your absolute decrees … Relativism is neither a method of fighting, nor a method of creating, for both of these are uncompromising and at times even ruthless; rather, it is a method of cognition. If one must fight or create, it is necessary that this be preceded by the broadest possible knowledge... One of the worst muddles of this age is its confusing of the ideas behind combative and cognitive activity. Cognition is not fighting, but once someone knows a lot, he will have much to fight for, so much that he will be called a relativist because of it.

“Politeness is organized indifference.”
Tel Quel (1943)

“Full of a sweet indifference.”
Charmian.

“The tragedy of love is indifference.”
The Trembling of a Leaf, ch. 4

“If moderation is a fault, then indifference is a crime.”
Not a Kerouac quote, but by Georg Christoph Lichtenberg (1742-1799), the German scientist, satirist, and Anglophile: http://www.quotes.net/quote/58450
Misattributed