Ye are the light of the world.

A city that is set on an hill cannot be hid.

Matthew 5:14

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...whosoever heareth these sayings of mine, and doeth them,

I will liken him unto a wise man, which built his house upon a rock:

And the rain descended, and the floods came,

and the winds blew, and beat upon that house;

and it fell not: for it was founded upon a rock.

Matthew 7:24-25

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See, "Lighthouses in very stormy weather" at:

http://www.youtube-nocookie.com/v/oNpH5tx4Pu8?fs=1&hl=en_US&rel=0

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