A physician's personal practice of self-control validates their health teachings.

Original passage

The physician's example, no less than his teaching, should be a positive power on the right side. The cause of reform calls for men and women whose life practice is an illustration of self-control. It is our practice of the principles we inculcate that gives them weight. The world needs a practical demonstration of what the grace of God can do in restoring to human beings their lost kingship, giving them mastery of themselves. There is nothing that the world needs so much as a knowledge of the gospel's saving power revealed in Christlike lives.