Your daughter's health would have been better had she been educated to physical labor. Her muscles and nerves are weak, lax, and feeble. How can they be otherwise when they have so little use? This child has but little power of endurance. A small amount of physical exercise wearies her and endangers health. There is not elasticity in muscles and nerves. Her physical powers have so long lain dormant that her life is nearly useless. Mistaken mother! know you not that in giving your daughter so many privileges of learning the sciences, and not educating her to usefulness and household labor, you do her a great injury? This exercise would have hardened, or confirmed, her constitution and improved her health. Instead of this tenderness proving a blessing, it will prove a terrible curse. Had the family burdens been shared with the daughter, the mother would not have overdone, and might have saved herself much suffering and benefited the daughter all the time. She should not now commence to l…
"For bodily exercise profiteth little: but godliness is profitable unto all things, having promise of the life that now is, and of that which is to come."
While 1 Timothy 4:8 speaks of the limited profit of bodily exercise compared to godliness, EGW emphasizes the importance of physical labor for health. There's a thematic connection in that both address the value of physical activity, though with different emphases.
Sister C has a diseased imagination. She has secluded herself from the air until she cannot endure it without inconvenience. The heat of her room is very injurious to health. Her circulation is depressed. She has lived in the hot air so much that she cannot endure the exposure of a ride out of doors without realizing a change. Her poor health is owing somewhat to the exclusion of air, and she has become so tender that she cannot have air without making her sick. If she continues to indulge this diseased imagination, she will be able to bear scarcely a breath of air. She ought to have the windows lowered in her room all through the day, that there may be a circulation of air. God is not pleased with her for thus murdering herself. It is unnecessary. She has become thus sensitive through indulging a diseased mind. Air she needs, air she must have. She is destroying not only her own vitality, but that of her husband and daughter, and of all who visit her. The air in her room is decidedly …
"A merry heart doeth good like a medicine: but a broken spirit drieth the bones."
Both passages connect mental/emotional state with physical health. EGW speaks of a 'diseased imagination' leading to physical problems, while Proverbs 17:22 contrasts a merry heart with a broken spirit and their respective effects on the body. The connection is thematic, not direct.