Were you to ask me to recommend the most valuable book in the world, I should fix on the Bible as the most instructive, both to the wise and ignorant. Were you to ask me for one [book], affording the most rational and pleasing entertainment to the inquiring mind, I should repeat, it is the Bible: and should you renew the inquiry, for the best philosophy, or the most interesting history, I should still urge you to look into your Bible. I would make it, in short, the Alpha and Omega of knowledge.
– Elias Boudinot (1740-1821), American lawyer and statesman; a president of the Continental Congress
Source: U-Turn: Restoring America to the Strength of its Roots by David Barton and George Barna, Frontline, 2014, page 157.
For a longer list of quotes like this, see Historic Quotes About the Bible.