Friends:

How is the Mutual Co-Dependence of Faith?

Having faith, an effort is made! By making an effort, the faith increases!
Having faith, awareness is setup! By setup of awareness, faith is clarified!
Having faith focuses concentration! By concentration faith is condensed!
Having faith one understands! One who understands confirms his faith!
Having faith it is exercised; because it is trained this faith grows stronger...
Having faith it is established; by being established this faith is consolidated...

For fine further Faith (Saddhā)  please see:
https://What-Buddha-Said.net/drops/III/Going_Forth_Faith.htm
https://What-Buddha-Said.net/drops/III/Outstanding_Faith.htm
https://What-Buddha-Said.net/drops/III/Unwavering_Faith.htm
https://What-Buddha-Said.net/drops/III/Analysis_of_Faith.htm
https://What-Buddha-Said.net/drops/III/Power_of_Faith.htm
https://What-Buddha-Said.net/drops/III/Faith_Summary.htm
https://What-Buddha-Said.net/drops/III/Highest_Faith.htm
https://What-Buddha-Said.net/drops/III/Fruitful_Faith.htm
https://What-Buddha-Said.net/drops/III/Leaping_Faith.htm
https://What-Buddha-Said.net/drops/III/Mutual_Faith.htm
https://What-Buddha-Said.net/drops/III/Dual_Faith.htm
https://What-Buddha-Said.net/drops/III/Fine_Faith.htm
https://What-Buddha-Said.net/drops/III/Rich_Faith.htm
https://What-Buddha-Said.net/drops/III/Lay_Faith.htm    



Source: Sariputta - The General of the Dhamma -
The Canonical: Path of Discrimination: Patisambhidamagga. IV.
http://store.pariyatti.org/Path-of-Discrimination-2nd-Edition_p_2126.html

Faith Depends ..