What is the theme for the fable the mouse and the lion

The moral of the story is that mercy brings its reward and that there is no being so small that it cannot help a greater, but I do now know what the theme is unless the theme and moral are the same. I'm sorry I hope this helps though!

A good act gets its return, Even the strongest may need help, and Everything counts in life, even the smallest.
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i hope this helps you 
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Zane

Ifound this on google “what are motifs? a motif is a literary term that is an idea, object, or concept that repeats itself throughout a text. a motif gives clues to theme or reinforces ideas an author wants to emphasize.” i hope this for what your looking for