What is the origin of the Five Enobling Virtues? "The practice of precepts helps one to cultivate five ennobling virtues which correspond to each of the precepts. The first is the cultivation of compassion; the second, generosity and non-attachment; the third, contentment; the fourth truthfulness; and the fifth, mindfulness and clarity of the mind."


I found this quote with a reference to The Five Precepts and the Five Ennoblers (pañcasīla-pañcadhamma) by Prince Vajirañāṇavarorasa --
but I can't locate the text anywhere or find anything about it. Can any one shed some light on this?
I found it here for free download:


The Five Precepts :
The Buddhist Golden Rule
By His Royal Highness the late Supreme
Patriarch Prince Vajirananavarorasa


I found it linked from this page: 'The 5 Precepts' at dharmaflower.net.

The quote you're looking for is on page 2:


  Contrasted with the negative virtues of precepts, there is also a set of five
  positive practices, which correspond to them, thus forming a complete practice
  of virtue. They are:
  
  
  Loving-kindness and compassion.
  Patience in the right means of livelihood.
  Contentment in married life.
  Truthfulness.
  Watchfulness. 
  


The precepts are described further on pages 4 through 34. Starting on page 34 it begins to describe the corresponding virtues; for example it starts with,


  The Five Ennobling Virtues
  
  The qualities of a virtuous person are mentioned in the scriptures, referring to
  precepts (síla) and ennobling virtues (kalyana dhamma). One who has fully
  observed the precepts is not necessarily one who is equipped with virtue. For
  example, when such a person happens to see a drowning man while he is
  passing by in a boat, he is morally bound to stop the boat and to save that
  man.
  
  If he cannot be bothered to do so, in spite of his ability, and he leaves the man
  to drown. However, one can say that he has not broken any precepts, but he
  has certainly lost something higher than precepts and will surely be severely
  censured for his positive lack of virtue.


The rest of the article (through page 49) describes the virtues.



I've just started reading it, an interesting text and author. Wikipedia says ...


  He helped to institutionalize Thai Buddhism.


... and I think this was probably a primary function of this text based on how it reconciles Buddhism with the needs of a state. A striking example: 


  From the point of view of both Buddhism and the state, killing is held to be a capital crime. In the case of Buddhism, a Bhikkhu (monk) who is guilty of such an offense is called a defeated one (parajika) and is to be expelled from the Order of Monks (Sangha).
  
  In the case of the state, unless the accused can prove himself to be deserving of leniency due to some reasonable excuse, the law of the country generally metes out some form of capital punishment or mitigates this to life imprisonment."