"In order to render to God perfect service, you must have clear conceptions of His requirements. You should use the most simple food, prepared in the most simple manner, that the fine nerves of the brain be not weakened, benumbed, or paralyzed, making it impossible for you to discern sacred things, and to value the atonement, the cleansing blood of Christ, as of priceless worth. “Know ye not that they which run in a race run all, but one receiveth the prize? So run, that ye may obtain. And every man that striveth for the mastery is temperate in all things. Now they do it to obtain a corruptible crown; but we an incorruptible. I therefore so run, not as uncertainly; so fight I, not as one that beateth the air: 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.” 2T 46.1"
"Know ye not that they which run in a race run all, but one receiveth the prize? So run, that ye may obtain."
The EGW passage directly quotes 1 Corinthians 9:24.