"strength. If he is feeble, he cannot endure the wearing labor incident to his calling. A man who has a weak constitution, who is a dyspeptic, or who is lacking in self-control cannot become qualified to deal with all classes of disease. Great care should be taken not to encourage persons who might be useful in some less responsible position, to study medicine at a great outlay of time and means, when there is no reasonable hope that they will succeed. CT 473.1"
"But I keep under my body, and bring it into subjection: lest that by any means, when I have preached to others, I myself should be a castaway."
Both passages emphasize the importance of self-control and physical discipline. EGW discusses the need for physicians to have strength and self-control to endure the demands of their profession, while 1 Corinthians 9:27 speaks of keeping the body under subjection to avoid being disqualified. The underlying principle of self-mastery for effective service is present in both.