god is the only person who knows the future, and that why is why he could reveal it to nebucadnetsar, king of babylon in a dream. he showed to that king the image of a statue with five parts: a head of gold, a chess of silver, a belly of bronze, the legs of iron, and a 'last part made of iron and silver'. jesus said in luke 21.24 that that statue represents the "times of the gentiles."
Read next