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For every gain in deep certitude there is a corresponding growth of superficial "doubt." This doubt is by no means opposed to genuine faith, but it mercilessly examines and questions the spurious "faith" of everyday life, the human faith which is nothing but the passive acceptance of conventional opinion.

Thomas Merton (2007). “New Seeds of Contemplation”, p.12, New Directions Publishing
For every gain in deep certitude there is a corresponding growth of superficial doubt. This doubt is by no means opposed to genuine faith, but it mercilessly examines and questions the spurious faith of everyday life,