Hast thou not known?

Hast thou not heard?
that the everlasting God, the Lord,
the Creator of the ends of the earth,
fainteth not,
neither is weary.
There is no searching of his understanding.
He giveth power to the faint;
and to them that have no might
he increaseth strength.
Even the youths shall faint and be weary,
and the young men shall utterly fall:
But they that wait upon the Lord
shall renew their strength;
they shall mount up with wings like eagles;
they shall run, and not be weary;
and they shall walk, and not faint.
Isaiah 40:28-31