— Isaac Bashevis Singer Polish-born Jewish-American author 1902 - 1991
An ironic statement which Singer made in many interviews over many years; here quoted in "Isaac Singer’s Promised City" http://www.city-journal.org/html/7_3_urbanities-isaac.html City Journal (Summer 1997)
Variants or variant translations:
We must believe in free will — we have no other choice.
You must believe in free will; there is no choice.
We have to believe in free will. We’ve got no choice.
This makes more sense if you consider the statement "we must believe in free will; we have no [other logical] choice"