Um navio esta seguro no porto, mas os navios nao foram feitos para isto.

William G.T. Shedd, 1820-1894

https://commons.wikimedia.org/wiki/File:A_ship_is_safe_in_harbor,_but_that%27s_not_what_ships_are_for._William_GT_Shedd,_1820-1894_-_pt.svg

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A ship is safe in harbor, but that's not what ships are for.