The excursions of the imagination are so boundless.—Journal, 20 September 1851
The forcible writer does not go far for his themes—his ideas are not far-fetched.—Journal, 29 January 1852
The imagination never forgives an insult.—Journal, 17 October 1850
The world is but a canvas to our imaginations.—A Week on the Concord and Merrimack Rivers
They are of sick and diseased imagination who would toll the world's knell so soon.—"Natural History of Massachusetts"
We should endeavor practically in our lives to correct all the defects which our imagination detects.—Thoreau to H.G.O. Blake, 2 May 1848
What is this heaven which they expect, if it is no better than they expect? Are they prepared for a better than they can now imagine?—A Week on the Concord and Merrimack Rivers 
When one man has reduced a fact of the imagination to be a fact to his understanding, I foresee that all men will at length establish their lives on that basis.—Walden
Who knows how incessant a surveillance a strong man may maintain over himself, -- how far subject passion and appetite to reason, and lead the life his imagination paints?—Journal, 21 May 1839
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