en_tn/isa/40/31.md

they will soar with wings like eagles

People receiving strength from Yahweh is spoken of as if the people were able to fly like eagles fly. An eagle is a bird often used as a symbol for strength and power. (See: rc://en/ta/man/jit/figs-metaphor)

they will run and not be weary; they will walk and not faint

These two lines share similar meanings. People receiving strength from Yahweh is spoken of as if they were able to run and walk without tiring. (See: rc://en/ta/man/jit/figs-parallelism and rc://en/ta/man/jit/figs-metaphor)