[Testimonies for the Church 2:412-414 (1868).]
(CH 160)
It is sin to be intemperate in the quantity of food eaten, even if the quality is unobjectionable. Many feel that if they do not eat meat and the grosser articles of food, they may eat of simple food until they cannot well eat more. This is a mistake. Many professed health reformers are nothing less than gluttons. They lay upon the digestive organs so great a burden that the vitality of the system is exhausted in the effort to dispose of it. It also has a depressing influence upon the intellect, for the brain nerve power is called upon to assist the stomach in its work. Overeating, even of the simplest food, benumbs the sensitive nerves of the brain and weakens its vitality. Overeating has a worse effect upon the system than overworking; the energies of the soul are more effectually prostrated by intemperate eating than by intemperate working.
(CH 160.1)
The digestive organs should never be burdened with a quantity or quality of food which it will tax the system to appropriate. All that is taken into the stomach, above what the system can use to convert into good blood, clogs the machinery, for it cannot be made into either flesh or blood, and its presence burdens the liver and produces a morbid condition of the system. The stomach is overworked in its efforts to dispose of it, and then there is a sense of languor which is interpreted to mean hunger, and without allowing the digestive organs time to rest from their severe labor, to recruit their energies, another immoderate amount is taken into the stomach, to set the weary machinery again in motion. The system receives less nourishment from too great a quantity of food, even of the right quality, than from a moderate quantity taken at regular periods....
(CH 160.2)
It is impossible to have clear conceptions of eternal things unless the mind is trained to dwell upon elevated themes. All the passions must be brought under perfect subjection to the moral powers. When men and women profess strong faith and earnest spirituality, I know that their profession is false if they have not brought all their passions under control. God requires this. The reason why such spiritual darkness prevails is that the mind is content to take a low level and is not directed upward in a pure, holy, and heavenly channel.
(CH 161.1)