How do you explain a rainbow to a blind man?

He has no concept of light, no concept of color, no ability to connect anything you say to reality? Additionally How do you explain the Supernatural the Spiritually blind (Atheist) He has no concept of Spirituality, no concept of Faith, no ability to connect anything you say to reality? inspired by a user who... show more He has no concept of light, no concept of color, no ability to connect anything you say to reality?

Additionally How do you explain the Supernatural the Spiritually blind (Atheist)

He has no concept of Spirituality, no concept of Faith, no ability to connect anything you say to reality?

inspired by a user who thinks my ability to explain spiritual things to him is my limitation, or the subjects limitations
Update: reality should be HIS reality
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