-So that you may know that it is I-

Isaiah 45:1-3
Thus says the LORD to Cyrus His anointed,
Whom I have taken by the right hand,
To subdue nations before him
And to loose the loins of kings;
To open doors before him so that gates will not be shut:
"I will go before you and make the rough places smooth;
I will shatter the doors of bronze and cut through their iron bars.
"I will give you the treasures of darkness
And hidden wealth of secret places,
So that you may know that it is I,
The LORD, the God of Israel, who calls you by your name.

Isaiah 40:28-31
Do you not know? Have you not heard?
The Everlasting God, the LORD, the Creator of the ends of the earth
Does not become weary or tired
His understanding is inscrutable.
He gives strength to the weary,
And to him who lacks might He increases power.
Though youths grow weary and tired,
And vigorous young men stumble badly,
~Yet those who wait for the LORD
Will gain new strength;
They will mount up with wings like eagles,
They will run and not get tired,
They will walk and not become weary.