Doubt–Curse or Blessing?

gdide:
The great Victor Hugo, suffering in exile, was seeking answers to spiritual questions when a spirit identifying himself as Martin Luther reportedly communicated with him (via medium).
Hugo asked Luther why God does not better reveal himself, to which Luther responded:
“Because doubt is the instrument which forges the human spirit.
If the day were to come when the human spirit no longer doubted, the human soul would fly off and leave the plough behind, for it would have acquired wings.
The earth would lie fallow.
Now, God is the sower and man is the harvester.
The celestial seed demands that the human ploughshare shall remain in the furrow of life.”

from Vital Signs

-Sheik al-Bob