ANSWER: It is said by those who believe that eternal life once given can never be lost, that the "end" in this text is not the end of life, but the end of God's judgment on the destruction of Jerusalem, and that it is not spoken of "in connection with the Gospel message," in reference to the end of life, but to the end of the world. This exigesis will not fit an earlier use of this form found in Matt. 10:22, "Ye shall be hated for my name's sake" (the normal condition of an aggressive Gospel); "but he that endureth to the end" (of life evidently) "the same shall be saved."
— Steele's Answers pp. 97, 98.