The Bible contains more knowledge necessary to man in his present state, than any other book in the world.
By renouncing the Bible, philosophers swing from their moorings upon all moral subjects. . . . It is the only correct map of the human heart that ever has been published.
– Benjamin Rush (1746-1813), American physician, politician, social reformer, educator and humanitarian; a signer of the Declaration of Independence
Source: U-Turn: Restoring America to the Strength of its Roots by David Barton and George Barna, Frontline, 2014, page 158.
For a longer list of quotes like this, see Historic Quotes About the Bible.