"We must re-learn the essential truth that Christian prayer is rather like cleaning a car. When we are lucky enough to have a new one, we wash and polish away with enthusiastic fervour, it is a devotional job. when the novelty wears off it becomes rather a nuisance and rather a bore, but we can still clean it efficiently, and here is the one vital point: there is no difference whatever in the result."
(Martin Thornton Christian Proficiency, quoted in Eugene Peterson Practice Resurrection p147)
There will be some of you who can relate to this. As someone who washes the car roughly twice a year, and only then after a great degree of domestic encouragement, if that was a picture of my prayer life I'd be in deep trouble.