"properly developed and to retain healthful vigor. Each organ has its work to do in the living organism. Every wheel in the machinery must be a living, active, working wheel. All the faculties have a bearing upon one another, and all need to be exercised in order to be properly developed. 3T 310.2"
"For the body is not one member, but many."
Both passages use the analogy of a body or machine with interconnected parts to illustrate the importance of each individual component working together for the overall health and function of the whole. The connection is thematic and relevant.
"Brother and Sister A, neither of you enjoy physical, domestic labor. Both of you need to cultivate a love for the practical duties of life. This education is necessary for your health and will increase your usefulness. You think too much of what you eat. You should not touch those things which will give a poor quality of blood; both of you have scrofula. 3T 310.3"
"What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God’s."
The EGW passage encourages caring for one's physical health through proper diet and exercise, which aligns with the principle in 1 Corinthians 6:19-20 that our bodies are temples of the Holy Spirit and should be treated with respect.