Immediately, the boy's father cried out and said, "I do believe; help my unbelief."

Mark 9:24

Macarthur Study Bible commentary:

"Admitting the imperfection of his faith, mixed as it was with doubt, the desperate father pleaded with Jesus to help him to have the greater faith the Lord demanded of him."

i'm constantly made aware of the imperfection of my faith juxtaposed with the gravity of my sin. 

this simple cry of repentance and earnest appeal to the Lord is an awesome prayer for times of uncertainty.