without being frightened in any way by those who oppose you. This is a clear sign of their destruction but of your salvation, and it is from God.
And not frightened in anything by opponents, which is a sign to them of destruction but of salvation for believers, and that from God.
It interprets fearless endurance as a sign.
27Nevertheless, conduct yourselves in a manner worthy of the gospel of Christ. Then, whether I come and see you or only hear about you in my absence, I will know that you stand firm in one spirit, contending together as one for the faith of the gospel, 28without being frightened in any way by those who oppose you. This is a clear sign of their destruction but of your salvation, and it is from God. 29For it has been granted to you on behalf of Christ not only to believe in Him, but also to suffer for Him, 30since you are encountering the same struggle you saw I had, and now hear that I still have.