Jamieson, Fausset & Brown

suffer--rather, as the Greek is the same as in Ti2 2:10, "If we endure (with Him)" (Rom 8:17). reign with him--The peculiar privilege of the elect Church now suffering with Christ, then to reign with Him (see on Co1 6:2). Reigning is something more than mere salvation (Rom 5:17; Rev 3:21; Rev 5:10; Rev 20:4-5). deny--with the mouth. As "believe" with the heart follows, Ti2 2:12. Compare the opposite, "confess with thy mouth" and "believe in thine heart" (Rom 10:9-10). he also will deny us-- (Mat 10:33).