Quote from a program at a Coolidge memorial service (1933); cited in The Oxford Dictionary of Quotations (1999). The passage did not originate with Coolidge, but evolved over several decades, appearing as early as 1881 in a youth guidance book. From
More quotes by Calvin Coolidge
There is no substitute for a militant freedom. The only alternative is submission and slavery.
That man has offered me unsolicited advice for six years, all of it bad!
The Constitution is the sole source and guaranty of national freedom.
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Attempt the end, and never stand to doubt;
Nothing's so hard but search will find it out.
All theory is against the freedom of the will; all experience for it.
Attribution
Quote text and notes from Wikiquote: Calvin Coolidge (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.