Teach me how to find one paragraph repeated several times in the song?

Audition doesn't have tools for doing this, in just the same way that no other software does...

The tools that are absolutely best suited to this process are located on the sides of your head!

Basically you're asking software to do the listening for you, and even if it could, there's no way you could train it to listen out for a phrase, especially if it's masked by other sounds - i..e. music. Audition is an audio tool, and as such it can only make content decisions about things like noise, where it's statistically able to isolate the spectrum of a sound - but this doesn't extend to spoken or sung phrases as such, I'm afraid.