A quote
He complains that he has heard sounds, when he has not heard them at all. The reason, you ask? His soul is in an uproar; it must be soothed, and its rebellious murmuring checked. You need not suppose that the soul is at peace when the body is still. Sometimes quiet means disquiet. We must therefore rouse ourselves to action and busy ourselves with interests that are good, as often as we are in the grasp of an uncontrollable sluggishness.
Seneca·Letter 56 — On Quiet and Study (§8)·trans. Gummere