but those who are hoping in Jehovah will regain power. They will mount up with wings like eagles. They will run and not grow weary; they will walk and not tire out.”​—Isaiah 40:29-31.

Yet, Jehovah promises to give power​—unwearied power to run and to walk—​to those who are trusting in him. The seemingly effortless flight of the eagle, a powerful bird that can soar for hours at a time, is used to illustrate how Jehovah empowers his servants.e With prospects of such divine support, the Jewish exiles have no cause for despair.

Meanwhile, we need not endure in our own strength. Jehovah, whose resources are inexhaustible, can impart power​—even “power beyond what is normal”—​to his servants in times of trial.​—2 Corinthians 4:7.