Isaiah 40:30-31 Even youths shall faint and be weary, and young men shall fall exhausted; 31 but they who wait for the Lord shall renew their strength; they shall mount up with wings like eagles; they shall run and not be weary; they shall walk and not faint. #Bible
Young men who are full of energy with seemingly inexhaustible strength, without God will faint and become weary, and fall, exhausted.
But those who wait, for the Lord, the self existent, eternal, Jehovah, shall renew.
Like an eagle molting new wings, they shall renew their strength. Getting that second wind, they will run and not tire easily or become weary. They will not faint walking as in the midday sun.
In whatever we do, doing it under the direction of our Lord will bring us through. The trials of this life will not tear us down, but build us up, strengthened like an eagle with a fresh set of wings.
However long it takes to grow a new set of wings is a good amount of time for the Lord to renew our strength, so lets wait, depending on the Lord.