A conclusion to be made based on presented facts or information : a main point or key message to be learned or understood from something experienced or observed
I believe that the answer to the question asked above is that the expression means you have to carry something before achieving something or going somewhere.
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Answer:
The geographic surroundings near Greece.
Explanation:
Greek myths are famous for their incorporation of characters from mortals to immortals/gods. Moreover, such stories are also known for their depiction of Greek life, society, culture, architecture, land, etc.
In the given excerpt from Perseus, the narrator talks of the "<em>islands rising high above the sea, many islands.</em>" Such descriptions provide readers with a picture of the geographical surroundings of the land. This is one feature of all myths.
Thus, the passage shows the geographical surroundings near Greece.