Need help understanding this I am reading up on the jhana and theres this paragraphs. There talking about the 3 ways Beginning, Middle &amp; End and the 10 characteristic of jhana. I'm not sure what im suppose to do or what this is suppose to mean. The book is the path to purification. 


  “‘Of the first jhána intensification of equanimity is the middle’: how many
  characteristics has the middle? The middle has three characteristics. He [now]
  looks on with equanimity at the mind that is purified; he looks on with equanimity
  at it as having made way for serenity; he looks on with equanimity at the
  appearance of unity.32 And in that he [now] looks on with equanimity at the
  mind that is purified and looks on with equanimity at it as having made way for
  serenity and looks on with equanimity at the appearance of unity, that
  intensification of equanimity is the middle of the first jhána. These are the three
  characteristics of the middle. Hence it is said: ‘The first jhána is good in the
  middle which possesses three characteristics.’


Heres the full page. The parts specifically im asking about is on line 112
That is an effect of dasavidhaappanākosallaṃ, that appear before your quote.

My link is just a head. There is more information in that book after the head.

For a guideline:

Beginning = complete and perfect practicing of all dasavidhaappanākosallaṃ (achieved jhāna). 

Middle = an effect of the 7th of dasavidhaappanākosallaṃ.

End = an effect of the 6th of dasavidhaappanākosallaṃ.

You must memorize dasavidhaappanākosallaṃ head, and meditate it to get a deep understanding.

Note: I never read throughout the english translation version (my english is terrible), that make me not sure about the translation's quality. So you can ask more, if you see something that is unclear.