If he can witness the effect it has, he's not "believing" anything, he's observing and drawing conclusions based on those observations. Nor would I even say one can't "touch" the wind. I touch it all the time, I can feel it quite readily. It's not just an observable phenomenon, it's an easily observable phenomenon.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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