Pilgrim's Progress

The surveyors have been about mending the slough for some sixteen hundred years. 

His labourers also have, by the direction of His Majesty's surveyors, been for above these sixteen hundred years employed about this patch of ground, if perhaps it might have been mended: yea, and to my knowledge, said he, here have been swallowed up at least twenty thousand cart-loads, yea, millions of wholesome instructions, that have at all seasons been brought from all places of the King's dominions, and they that can tell, say they are the best materials to make good ground of the place; if so be, it might have been mended, but it is the Slough of Despond still, and so will be when they have done what they can.