When I was converted, I made this mistake: I thought the battle was already mine, the victory already won, the crown already in my grasp. I thought the old things had passed away, that all things had become new, and that my old, corrupt nature, the old life, was gone. But I found out, after serving Christ for a few months, that conversion was only like enlisting in the army – that there was a battle on hand.
(D. L. Moody)
"Therefore the Lord himself will give you a sign: The virgin will be with child and will give birth to a son, and you will call him Immanuel."
Isaiah 7: 14