When I ask myself how I know I believe, I have no satisfactory answer at all, no assurance at all, no feeling at all. I can only say with Peter, Lord I believe, help my unbelief. And all I can say about my love of God, is, Lord help me in my lack of it. I distrust pious phrases, particularly when they issue from my mouth. I try militantly never to be affected by the pious language of the faithful but it is always coming out when you least expect it. In contrast to the pious language of the faithful, the liturgy is beautifully flat.
Flannery O’Connor, The Habit of Being p. 92
Please be advised that it’s not actually Peter who said that.