"Again the Lord spoke to Ahaz, 'Ask the Lord your God for a sign, whether in the deepest depths or in the highest heights.'" NIV translation
Not only did God give Ahaz words of encouragement but He also gave Ahaz permission to ask Him for a sign to prove it was true. We are reminded that God is in control of everything as He tells Ahaz that the sign can be from the depths or the heights and it didn't matter. There are those that say asking for a sign from God demonstrates a lack of faith but there are many examples throughout His Word of great men of faith asking for a sign. God gives each of us signs in our daily walk with Him. Many are not looking for them and so do not recognize the hand of God.
"But Ahaz said, 'I will not ask; I will not put the Lord to the test.'" NIV translation
Ahaz's reply to God is a "religious" answer from a phony. Although his answer is based on a passage from scripture (Deuteronomy 6:16), the man has turned his back on God and is doing all kinds of things that the Lord does not like. God does not want us to pick and choose the parts of His Word that we
like and ignore the rest.
"Then Isaiah said, 'Hear now, you house of David! Is it not enough to try the patience of men? Will you try the patience of my God also?'" NIV translation
After the phony religious answer of Ahaz, Isaiah reminds him that he is dealing with God. God knows the heart of all of us and He is patient but He is still the Almighty God.
"'Therefore the Lord himself will give you a sign: The virgin will be with child and will give birth to a son, and will call him Immanuel." NIV translation
The sign that Isaiah prophesied was fulfilled in Jesus Christ, as described in Matthew 1:18-25. This was a sign that could not be explained in any way except by the very hand of God.
"He will eat curds and honey when he knows enough to reject the wrong and choose the right." NIV translation
This verse speaks to the fact that Jesus would be a normal man in that he started as a baby. The baby would have nursed from his mother until the time to eat solid food and Jesus did the same. It , too, reminds us that as new children in Christ, we are not to live forever on milk but are to grow to feed on solid food. This was also talked about in Hebrews 5:11-14.