I was listening to the radio recently and a guy whose name I did not quickly enough scribble down on paper, made a quoteable quote — something my Dad might say or some other wise plainly spoken person.
Whenever you begin to question whether your prayer is worth the time and effort, whenever nothing seems to be gained from it, remember: “If you sit on the railroad tracks long enough, eventually you will get hit.”
Perhaps the language different from what you would read in a spiritual classic, but it makes the point: Persevere in prayer!