The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
sister
A wife who is a sister.
carnel
That is, things for the body.
without
The expression is peculiar and might be literally rendered, "not lawless toward God, but inlawed to Christ."
See "Law (of Christ)," (Gal 6:2); (Jo2 1:5).
It is another way of saying, "not under the law, but under the rule of grace." (Rom 6:14).
save
(See Scofield) - (Rom 1:16).
race
Race-course.
castaway
(Greek, "adokimos", "disapproved"). Greek, "dokimos", without the private, "a", is translated "approved" in (Rom 14:18); (Rom 16:10); (Co1 11:19); (Co2 10:18); (Co2 13:7); (Ti2 2:15); and in (Jam 1:12); by the word "tried." The prefix simply changes the word to a negative, that is, not approved, or, disapproved. The apostle is writing of service, not of salvation. He is not expressing fear that he may fail of salvation but of his crown.