"“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.” Those who engaged in running the race to obtain that laurel which was considered a special honor were temperate in all things so that their muscles, their brains, and every part of them might be in the very best condition to run. If they were not temperate in all things they would not have that elasticity that they would have if they were. If temperate, they could run that race more successfully; they were more sure of receiving the crown. 2T 357.1"
"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."
EGW directly quotes and elaborates on 1 Corinthians 9:24-27.