Steadfastness: should be Manifested in Striving for the Faith of the Gospel
Source: TTT
Philippians 1:27
Nevertheless, 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 side by side for the faith of the gospel,
Jude 1:3
Beloved, although I made every effort to write to you about the salvation we share, I felt it necessary to write and urge you to contend earnestly for the faith entrusted once for all to the saints.