9:24-27 The apostle compares himself to the racers and combatants in the Isthmian games, well known by the Corinthians. But in the Christian race all may run so as to obtain. There is the greatest encouragement, therefore, to persevere with all our strength, in this course. Those who ran in these games were kept to a spare diet. They used themselves to hardships. They practised the exercises. And those who pursue the interests of their souls, must combat hard with fleshly lusts. The body must not be suffered to rule. The apostle presses this advice on the Corinthians. He sets before himself and them the danger of yielding to fleshly desires, pampering the body, and its lusts and appetites. Holy fear of himself was needed to keep an apostle faithful: how much more is it needful for our preservation! Let us learn from hence humility and caution, and to watch against dangers which surround us while in the body.

24. Know ye not—The Isthmian games, in which the foot race was a leading one, were of course well known, and a subject of patriotic pride to the Corinthians, who lived in the immediate neighborhood. These periodical games were to the Greeks rather a passion than a mere amusement: hence their suitableness as an image of Christian earnestness.

in a race—Greek, "in a race course."

all … one—Although we knew that one alone could be saved, still it Would be well worth our while to run [Bengel]. Even in the Christian race not "all" who enter on the race win (1Co 10:1-5).

So run, that ye may obtain—said parenthetically. These are the words in which the instructors of the young in the exercise schools (gymnasia) and the spectators on the race course exhorted their pupils to stimulate them to put forth all exertions. The gymnasium was a prominent feature in every Greek city. Every candidate had to take an oath that he had been ten months in training, and that he would violate none of the regulations (2Ti 2:5; compare 1Ti 4:7, 8). He lived on a strict self-denying diet, refraining from wine and pleasant foods, and enduring cold and heat and most laborious discipline. The "prize" awarded by the judge or umpire was a chaplet of green leaves; at the Isthmus, those of the indigenous pine, for which parsley leaves were temporarily substituted (1Co 9:25). The Greek for "obtain" is fully obtain. It is in vain to begin, unless we persevere to the end (Mt 10:22; 24:13; Re 2:10). The "so" expresses, Run with such perseverance in the heavenly course, as "all" the runners exhibit in the earthly "race" just spoken of: to the end that ye may attain the prize.