"With all sorts of doubts I am familiar, and the result of them is, has been, and will be, a widening of my heart and soul and mind to greater glories of the truth ... ... ... I cannot say I never doubt, nor until I hold the very heart of good as my very own in Him, can I wish not to doubt.  For doubt is the hammer that breaks the windows clouded with human fancies, and lets in the pure light."

-----George MacDonald, "From Letter to an Unknown lady."