So an angel approached Isaiah with a coal from the altar, and Isaiah's iniquity was taken away and his sin forgiven. Part of the message was, If you will not believe , you surely shall not be established. Abraham believed , and God counted that for righteousness . The righteousness God looks for is the righteousness of faith, and that is understandable considering that the Gentiles nations had rejected Him. Faith is the essential element in receiving God s Messiah Savior into your heart, so He can give you a new heart, cleanse you from sin, make you live forever with Him in His kingdom.
Faith is the key.
If you will not believe , you surely shall not be established . But Ahaz refused to ask for a sign. God wanted to give a sign, but when Ahaz kept refusing to seek the sign, the LORD left His message anyway. There was no intermediary. God personally delivered this prophesy, and God personally fulfilled it through His Spirit.