"believing in hope against hope"

Let him trust in the name of the Lord; not in himself, nor in any creature, but in the Lord himself; in the perfections of his nature, his mercy, grace, and goodness; in the name of the Lord, which is a strong tower, and in whom is salvation; in Christ, in whom the name of the Lord is, and whose name is the Lord our Righteousness; and to trust in him, when in the dark, is a glorious act of faith; this is believing in hope against hope.

And stay upon his God; covenant interest continues in the darkest dispensation; God is the believer's God still; and faith is a staying or leaning upon him, as such; a dependence upon his power to protect, on his wisdom to guide, and on his grace, goodness, and all sufficiency, to supply.

—John Gill