How many times has someone doubted their salvation? For me it was many times as a child. I knew that Jesus died for me. I knew my need for repentance and faith. But it was not until someone said something like that below that my doubts went away. Commenting on Colossians 1:4, Harry Ironside said this:
“People are troubled sometimes for fear their faith should not be of the right quality, or might prove of insufficient quantity to save them. But it is important to observe that it is not the character nor amount of faith that saves. It is the Person in whom faith rests.”
H. A. Ironside, Lectures on the Epistle to the Colossians, Neptune: Loizeaux Brothers, 1929, p. 23.