Isaiah 55:8-9 (NKJV)
8“For My thoughts are not your thoughts, Nor are your ways My ways,” says the LORD.
9 “For as the heavens are higher than the earth, So are My ways higher than your ways, And My thoughts than your thoughts.
God is simply saying that He does not think like human beings and His ways are far from how our ways/actions are displayed. We know that there is a vast distance between the heavens (sun, moon and stars). God says, His ways and thoughts are just that far from how we analyze or think things ought to be. After all, He does have the final say!