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In "The Screwtape Letters," A budding demon writes his Uncle Wormwood about a man who is doing all the right things when faced with adversity. Wormword's nephew just can't seem to get the man to fall away from "the enemy," God. Wormword encourages his Nephew to keep pressuring the man.
"...Whatever he says, let his inner resolution be not to bear whatever comes to him, but to bear it 'for a reasonable period' - and let the reasonable period be shorter than the trail is likely to last. It need not be much shorter; in attacks on patience, chastity, and fortitude, the fun is to make the man yield just when (had he but known it) relief was almost in sight."
Endure to the end...