Context gives teeth to words.

Luke 1:37 NLT

"For nothing is impossible with God. ”

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Somewhere around 1 A. D. -ish Gabriel the angel and the messenger of God was a busy dropping proverbial "bombs." The verse above was one of them.

In that busy year we first get a glimpse of his conversation with Zechariah. Zechariah wasn't a young man and when Gabriel tells him, he and his wife Elizabeth are going to have their very first baby Zechariah is left speechless. You see context changes the weight, meaning, and import of any words. I don't know if Gabriel is stunningly handsome or just shockingly otherworldly but it seems everyone be talks to is scared spitless.  If it weren't enough that the messenger is frightful his messages are earth shattering (that can be taken quite literally since Jesus is going to completely destroy this earth to make a new one, but that's an aside and not exactly Gabriel's story at this time).

So Gabriel tells Zechariah his son will be a prophet and not just any prophet but such a special one that he will usher in the King and bring an end to exile of people's hearts from the presence of God. Furthermore, John this baby born to very old first time parents will be filled with the Holy Spirit even from in the womb.

Nothing is impossible with God.

Maybe the most extraordinary part of Gabriel's announcement to Zechariah is the way in which God will use John to change people's hearts. Babies being born to old people seems a walk in the park every day occurrence compared to bringing about repentance in people's hearts. But God's Holy Spirit in and through John was going to begin a repentance revolution that lasts till today.

Now you see that is a reason to say nothing is impossible with God.

I won't go into Gabriel and Mary's conversation or the impossibilities associated with it but trust me when I say it leaves the whole Zechariah /John stuff in the dust for extraordinary!

Luke 1:45 NLT

You are blessed because you believed that the Lord would do what he said.”

Luke 1:77 NLT

You will tell his people how to find salvation through forgiveness of their sins.