48:4.19
While the humor of Urantia is exceedingly crude and most inartistic, it does serve a valuable purpose both as a health insurance and as a liberator of emotional pressure, thus preventing injurious nervous tension and overserious self-contemplation. Humor and play — relaxation — are never reactions of progressive exertion; always are they the echoes of a backward glance, a reminiscence of the past. Even on Urantia and as you now are, you always find it rejuvenating when for a short time you can suspend the exertions of the newer and higher intellectual efforts and revert to the more simple engagements of your ancestors.