"I know all about the despair of overcoming chronic temptations.--The Collected Letters of C. S. Lewis, Volume 2 (Cambridge University Press, 2004), letter to Mary Neylan, January 20, 1942 page 507; emphasis original
It is not serious provided self-offended petulance, annoyance at breaking records, impatience etc doesn't get the upper hand. No amount of falls will really undo us if we keep on picking ourselves up each time. We shall of course be very muddy and tattered children by the time we reach home. But the bathrooms are all ready, the towels put out, and the clean clothes are airing in the cupboard.
The only fatal thing is to lose one's temper and give it up. It is when we notice the dirt that God is most present to us: it is the very sign of His presence."
HT: Dane Ortlund