"Be assured that God will not work a miracle to save you from the result of your own course of action. You have not had a liberal supply of air. Brother I has labored in his store, closely applying himself to his business and allowing himself but a limited amount of air and exercise. His circulation is depressed. He breathes only from the top of his lungs. It is seldom that he exercises the abdominal muscles in the act of breathing. Stomach, liver, lungs, and brain are suffering for the want of deep, full inspirations of air, which would electrify the blood and impart to it a bright, lively color, and which alone can keep it pure and give tone and vigor to every part of the living machinery. 2T 67.1"
"Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap."
Both passages highlight the principle of reaping what you sow. EGW illustrates this with the example of neglecting health and experiencing the consequences, directly reflecting the principle in Galatians 6:7.