Perseverance. Action or condition of steadfastness. OT Israel waited generations for fulfillment of promises which many believers never lived to see (Heb 11:1, 13, 21, 22, 39). The promise to Abraham sustained hope for centuries before Canaan was possessed.
stead•fast \ˈsted-ˌfast also -fəst\ adjective
[Middle English stedefast, from Old English stedef+st, from stede + f+st fixed, fast] before 12th century
1 a: firmly fixed in place: IMMOVABLE
b: not subject to change 〈the steadfast doctrine of original sin—Ellen Glasgow〉
Some of the important Greek manuscripts read, “Let us have peace (echōmen) with God.” This seems to be the preferred reading. If so, then the sense is, “Let us keep on having (in the sense of enjoying) peace with God.” Peace has been made by God through our Lord Jesus Christ (cf. Eph. 2:14a), which fact is demonstrated by God’s justification. A believer is not responsible for having peace in the sense of making it but in the sense of enjoying it