'Steadfast' in the Bible

This hope [this confident assurance] we have as an anchor of the soul [it cannot slip and it cannot break down under whatever pressure bears upon it]—a safe and steadfast hope that enters within the veil [of the heavenly temple, that most Holy Place in which the very presence of God dwells],

For you have need of patient endurance [to bear up under difficult circumstances without compromising], so that when you have carried out the will of God, you may receive and enjoy to the full what is promised.