If they deny him they will not be saved. Paul's contradictory statement is easily understood. If you are saved, you are saved always. If you deny him, you will not be saved. The question is faith without works. Even if you lose your faith, you remain sealed until the day of redemption."If we suffer, we shall also reign with him: if we deny him, he also will deny us:"
13 In Him you also trusted, after you heard the word of truth, the gospel of your salvation; in whom also, having believed, you were sealed with the Holy Spirit of promise, 14 who is the guarantee of our inheritance until the redemption of the purchased possession, to the praise of His glory.