Most often, John presents this as a difference between spiritual sight and physical sight. Those who rely only on physical eyesight cannot begin to appreciate who Jesus is and what he is doing in the world. However, those blessed with spiritual sight eventually -- if imperfectly -- come to appreciate Jesus' promises and teachings more fully. In this sense, they are like the man born blind who is healed by Jesus; "I once was blind, but now I see."
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You can also listen to the related Communion meditation and benediction.