THE FOURFOLD GREAT STRUGGLE AGAINST SIN

The fourfold Great Struggle against sin is divided into kattâro Samappadhânâ, which are–

1. The struggle to prevent sinfulness arising.
2. The struggle to put away sinful states which have arisen.
3. The struggle to produce goodness not previously existing.
4. The struggle to increase goodness when it does exist.

Buddhist Suttas – MAHÂ-PARINIBBÂNA-SUTTANTA 
Translated from Pâli by T. W. Rhys Davids [1881]
http://www.sacred-texts.com/bud/sbe11/sbe1103.htm