Do You Know Him?

Isaiah 43:10-13 King James Version (KJV) 10 Ye are my witnesses, saith the Lord, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me. 11 I, even I, am the Lord; and beside me there is no saviour. 12 I have declared, and have saved, and I have shewed, when there was no strange god among you: therefore ye are my witnesses, saith the Lord, that I am God. 13 Yea, before the day was I am he; and there is none that can deliver out of my hand: I will work, and who shall let it?