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There is a certain class of unbelievers who sometimes ask me such questions as, if I think that I can live on vegetable food alone; and to strike at the root of the matter at once,--for the root is faith,--I am accustomed to answer such, that I can live on board nails. If they cannot understand that, they cannot understand much that I have to say.

Henry David Thoreau (2013). “The Essential Thoreau”, p.42, Simon and Schuster
There is a certain class of unbelievers who sometimes ask me such questions as, if I think that I can live on vegetable food alone; and to strike at the root of the matter at once,--for the root is faith,--I am