Shuddhi

 https://www.google.com/search?q=Shuddhi

1. holy places of pilgrimages, 
2. asceticism, and 
3. observance of vows 

depend on the 

1. purity of the articles (Dravya S’uddhi), 
2. on the purity and one pointedness of actions (Kriyâ S’uddhi) and 
3. on the purity of the mind and heart (Chitta S’uddhi). 

Some may attain, at times, the Dravya S’uddhi and Kriyâ S’uddhi; but every one finds it very difficult and, indeed, rarely get the Chitta S’uddhi. 

https://www.sacred-texts.com/hin/db/bk06ch12.htm