Give an example of an analogy used in the themes of the Koran?

The Quran has many examples of analogies.  One common theme is the comparison of Paradise with that of a garden.  Sura 37, vs 43 says

Save the chosen slaves of Allâh (i.e. the true believers of Islâmic Monotheism). (40) For them there will be a known provision (in Paradise), (41) Fruits; and they shall be honoured, (42) In the Gardens of delight (Paradise), (43)

Similarly in Sura 74, vs 36-40

To any of you that chooses to go forward (by working righteous deeds), or to remain behind (by commiting sins), (37) Every person is a pledge for what he has earned, (38) Except those on the Right, (i.e. the pious true believers of Islâmic Monotheism); (39) In Gardens (Paradise) they will ask one another, (40)

Considering the desert location of the origin of Islam, it makes sense that the wonders and beauty of Paradise would be explained in terms of that which they miss the most: a verdent garden with all the water it would need.