“The only difference between a rut and a grave are the dimensions.”
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Ellen Glasgow 4
Novelist, short story writer 1873–1945Related quotes

“The difference between treason and patriotism is only a matter of dates.”
Source: The Count of Monte Cristo

“The only difference between Bush and Hitler is that Hitler was elected.”
As quoted in "Kurt Vonnegut's 'Stardust Memory'" http://www.freepress.org/columns/display/7/2006/1326 by Harvey Wasserman in The Free Press (4 March 2006); in actuality, Hitler also wasn't elected by a clear majority vote. Although the Nazi Party was elected to the largest number of seats in the Reichstag, it did not have a majority, and could only form a government through a coalition. Eventually, Hitler was appointed as Chancellor by President Paul von Hindenburg, and used that position as leverage to gain dictatorial powers.
Various interviews

“The only difference between a human and an animal is in having inspiration.”

“The soul is the only difference between human beings and the dead.”

“CHOOSING WELL IS DIFFICULT, AND MOST DECISIONS HAVE SEVERAL different dimensions.”
The Paradox of Choice: Why More Is Less

“The only difference between reality and fiction is that fiction needs to be credible.”
“The difference between insanity and genius is measured only by success and failure.”

“The only difference between disappointment and depression is your level of commitment.”
Tickets Still Available (2006)
Variant: I think, in most cases, the difference between depression and disappointment is your level of commitment.