Do you not know?
Have you not heard?
The LORD is the everlasting God,
the Creator of the ends of the earth.
He will not grow tired or weary;
His understanding is beyond searching out.
He gives power to the faint
and increases the strength of the weak.
Even youths grow tired and weary,
and young men stumble and fall.
But those who wait upon the LORD will renew their strength;
they will mount up with wings like eagles;
they will run and not grow weary,
they will walk and not faint.
    — Isaiah 40:28-31