“If you will not believe surely you shall not be established” – believing is very important (Isaiah 7:9(b))
Believe in the LORD your God, and you shall be established; believe His prophets, and you shall prosper.” (2 Chronicles 20:20)
Two Sons of Isaiah the Prophet – Shear Jashub (a Remnant shall return) Isaiah 7:3
Isa 7:14 “Therefore the Lord Himself will give you a sign: Behold, the virgin shall conceive and bear a Son, and shall call His name Immanuel.
The Lord also whistles (Isaiah 7:18)