Regarding Faith
We must be so kindled that our heart burns,
as a fire, and we create our own light.
What will keep that flame burning hot is observance of the most important
teachings: Observing the Fast, Observing the Daily Obligatory Prayer,
Daily Recitation of the Greatest Name, and from the Writings.
Regular prayer is also very important, and the prayer immediately
following the Obligatory prayer is said to have profound effect.
I think that not holding strong to each of these will lead to a decline in Faith, but holding to them will establish it.