In order to render to God perfect service, you must have clear conceptions of His requirements. You should use the most simple food, prepared in the most simple manner, that the fine nerves of the brain be not weakened, benumbed, or paralyzed, making it impossible for you to discern sacred things, and to value the atonement, the cleansing blood of Christ, as of priceless worth.—Testimonies for the Church 2:46 (1868).
(CH 63.2)