The text under study can be found at https://www.bahai.org/library/authori....

Part 1:    • Introduction to Abdu'l-Baha's The Sec...  
Part 2:    • Introduction to Abdu'l-Baha's The Sec...  
Part 3:    • Introduction to Abdu'l-Baha's The Sec...  
Part 4:    • Introduction to Abdu'l-Baha's The Sec...  

The study outline can be downloaded here: http://www.loomofreality.org/sources/...