If we suffer, we shall also reign with him: if we deny him, he also will deny us:
Suffer. The Greek is the same as 2 Timothy 2:10 'If we endure (with Him),' etc. (Romans 8:17).
Reign with him - the special privilege of the elect now suffering with Christ (note, 1 Corinthians 6:2). Reigning is something more than bare salvation (Romans 5:17; Revelation 1:6; Revelation 3:21; Revelation 5:10; Revelation 20:4-5).
Deny - with the mouth. Denial by deed or by silence is included. "Believe" with the heart follows, 2 Timothy 2:13. Compare the opposite, "confess with thy month" and "believe in thine heart" (Romans 10:9-10). He also will deny us (Matthew 10:33).