This may be misattributed. It appears to be a direct and original quote from "Individuality and encounter: a brief journey into loneliness and sensitivity groups" by Dr Clark E Moustakas (1971 p15, prev 1968)
Attributed
“The long habit of living indisposeth us for dying.”
Source: Hydriotaphia, Urn Burial (1658), Chapter V
Help us to complete the source, original and additional information
Thomas Browne 78
English polymath 1605–1682Related quotes
“Sometimes the dying live more fiercely and wisely than the rest of us. (146)”
Source: God is No Laughing Matter
“Dying, dying, someone told me just recently, dying is easy. Living is hard. for everyone.”
MusiCares, May 14, 2006
“We get into the habit of living before acquiring the habit of thinking.”
The Myth of Sisyphus (1942), An Absurd Reasoning
“Character is simply habit long continued.”
Last words, 10/16/46. Quoted in "The Mammoth Book of Eyewitness World War II" - Page 566 - by Jon E. Lewis - History - 2002.