THE FOUR ROADS TO SAINTSHIP

The four Roads to Saintship are four means by which Iddhî (see above, § 3, note) is to be acquired. They are the Kattâro Iddhipâdâ:

1. The will to acquire it united to earnest meditation and the struggle against sin.
2. The necessary exertion united to earnest meditation and the struggle against sin.
3. The necessary preparation of the heart united to earnest meditation and the struggle against sin.
4. Investigation united to earnest meditation and the struggle against sin.

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