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Doubt is faith in the main: but faith, on the whole, is doubt; We cannot believe by proof: but could we believe without?

Algernon Charles Swinburne (2013). “Delphi Complete Works of Algernon Charles Swinburne (Illustrated)”, p.1484, Delphi Classics
Doubt is faith in the main: but faith, on the whole, is doubt; We cannot believe by proof: but could we believe without?