This promise of God was penned by the prophet Isaiah to the captives who sat by the waters of Babylon and wept while their tormentors called for them to sing glad songs of Zion. And so these promises of security are spoken to those who know the threat of waters that rise and flames that burn brightly. They have lost hope of going home and their only comfort is in the thought of revenge upon the children born to the Babylonians. (Psalm 137) But the promise of the One who formed them is that they will not be abandoned to captivity for the God who heard their cries in the past has heard them in the present. They will not be overwhelmed or consumed by the things that threaten them because they are precious, honored, loved, desirable objects of the Holy One’s affection. What we experience in this life is often beyond our ability to tread water or shield ourselves from searing heat but then the word of God calls us to not be afraid despite all that threatens. I think that means we do not believe the water of difficulty will have the last word for us even if we drown or that the fire of suffering will consume us. We are already eternal creatures known by name and treasured possessions of the God who exists in the past-present-future. So we endure in the midst of captivity and overcome all that would cause us to doubt our treasured status.