Check out this thought by George Matheson, a blind 19th c. Scottish Presbyterian minister:
What a strange cure for mental weariness…I should have expected an invitation to mental rest….The weariness of the body is cured by slumber, but the weariness of the mind can be cured only by stimulus.
He said this as he was meditating on Hebrews 12:3 (Consider him who endured such opposition from sinful men, so that you will not grow weary and lose heart). He suggests that an active meditational life on the work of Jesus will help promote rest and protect from mental weariness.
Quote found in Leaves for Quiet Hours, p. 141 (1904)
[reblogged; first published 2/8/07]