It is a common christian saying that "God's ways are higher than our ways." It could be something that is said in daily life. What God is saying in Isaiah 55 is that His way to salvation is higher and better than our way. God offers salvation to us freely and has given us grace. Grace is the difference between our way and God's way; between christianity and every other religion.
Our way vs God's way
Sunday, November 24, 2019