The blind man whom Jesus cured said, “I see men as trees walking.”
Christianity is a “convex” lens helping men to see, but it is too much
to expect a newly enlightened convert to see accurately all at once.
Convex spectacles are made for the use of patients who have
undergone the operation of removal of a cataract. A cataract
is merely the crystalline lens of the eye become opaque.
The convex lens of the spectacles supplies the place of the
crystalline lens. But the patient is obliged to learn distances
and dimensions after sight is thus restored, and during this
experience he often suffers illusions.
(260)