"The zeal of the LORD of hosts will perform this." - Isaiah 9:7
The promises listed of this glorious Son to be born is as sure to be done as God's promises. His zeal to make sure this happens speaks of His love of mercy and deliverance and grace (John 3:16).
Learn to stand on the promises of God. Learn to stand on them as already accomplished even when they are far from manifested yet. Learn to declare the dawn long before the darkness has gone. Then you will know the zeal of the LORD.