Reference request: where is this text about abandoning hindrances from? I found the text below on another site. However, it doesn't say whether the source is a specific sutta, commentaries or something else. Could someone show me the origin?


  Six things are conducive to the abandonment of restlessness and remorse:
  
  
  Knowledge of the Buddhist scriptures (Doctrine and Discipline);
  Asking questions about them;
  Familiarity with the Vinaya (the Code of Monastic Discipline, and for lay followers, with the principles of moral conduct);
  Association with those mature in age and experience, who possess dignity, restraint and calm;
  Noble friendship;
  Suitable conversation.
  


https://www.accesstoinsight.org/lib/authors/nyanaponika/wheel026.html
Source: Uddhacca,kukkucca by Piya Tan