Peter and John seek to encourage those who are exiles in their land and to hope in God to stand firm in their faith. While the temptation may come, perseverance is an attribute of faith.
Paul writes to Timothy to encourage him to stand against false teaching in Ephesus. Paul encourages Timothy to fight for the church because it is worth protecting.
Jesus paid the ultimate price for us and is our “great high priest.” We can have assurance because of His sacrifice and the testimony of those in the faith before us.