Billy Graham said this quote

I have never been to the North Pole, and yet I believe there is a North Pole. How do I know? I know because somebody told me. I read about it in a history book, I saw a map in a geography book, and I believe the men who wrote those books. I accept it by faith. The Bible says, “Faith cometh by hearing, and hearing by the word of God” [Romans 10:17 KJV].