There are said to be Four Forces that help us manifest the quality of Diligence in our lives. They are Aspiration, Steadfastness, Joyfulness, and Relinquishment. 

In this talk I read from the text "The Nectar of Manjushri's Speech" by Kunzang Pelden. You can get this book here:

https://www.amazon.com/Nectar-Manjushris-Speech-Shantidevas-Bodhisattva/dp/1590306996