In the days of King Herod of Judea, there was a priest named Zechariah, who belonged to the priestly order of Abijah. His wife was a descendant of Aaron, and her name was Elizabeth. Both of them were righteous before God, living blamelessly according to all the commandments and regulations of the Lord. But they had no children, because Elizabeth was barren, and both were getting on in years. Once when he was serving as priest before God and his section was on duty, he was chosen by lot, according to the custom of the priesthood, to enter the sanctuary of the Lord and offer incense. Now at the time of the incense offering, the whole assembly of the people was praying outside. Then there appeared to him an angel of the Lord, standing at the right side of the altar of incense. When Zechariah saw him, he was terrified; and fear overwhelmed him. But the angel said to him, “Do not be afraid, Zechariah, for your prayer has been heard. Your wife Elizabeth will bear you a son, and you will name him John. You will have joy and gladness, and many will rejoice at his birth, for he will be great in the sight of the Lord. He must never drink wine or strong drink; even before his birth he will be filled with the Holy Spirit. He will turn many of the people of Israel to the Lord their God. With the spirit and power of Elijah he will go before him, to turn the hearts of parents to their children, and the disobedient to the wisdom of the righteous, to make ready a people prepared for the Lord.” Zechariah said to the angel, “How will I know that this is so? For I am an old man, and my wife is getting on in years.” The angel replied, “I am Gabriel. I stand in the presence of God, and I have been sent to speak to you and to bring you this good news. But now, because you did not believe my words, which will be fulfilled in their time, you will become mute, unable to speak, until the day these things occur.” Meanwhile the people were waiting for Zechariah, and wondered at his delay in the sanctuary. When he did come out, he could not speak to them, and they realized that he had seen a vision in the sanctuary. He kept motioning to them and remained unable to speak. When his time of service was ended, he went to his home. After those days his wife Elizabeth conceived, and for five months she remained in seclusion. She said, “This is what the Lord has done for me when he looked favorably on me and took away the disgrace I have endured among my people.” (Luke 1:5-25, NRSV)
Because you did not believe what I have said to you, as I visited with you in the holy of holies where only the priests are allowed to come and no one else would be because this is where God is you will not be able to speak.
I know it would be hard to trust a message of you will have a child when you are beyond the childbearing years, but really? You have an angel appear to you as you are serving in the most holy part of the temple and you have to ask how you will know this is true?
We will know it is true because He has told us and He s one we can trust!

And just then some people were carrying a paralyzed man lying on a bed. When Jesus saw their faith, he said to the paralytic, “Take heart, son; your sins are forgiven.” Then some of the scribes said to themselves, “This man is blaspheming.” But Jesus, perceiving their thoughts, said, “Why do you think evil in your hearts? For which is easier, to say, ‘Your sins are forgiven,’ or to say, ‘Stand up and walk’? But so that you may know that the Son of Man has authority on earth to forgive sins”—he then said to the paralytic—“Stand up, take your bed and go to your home.” And he stood up and went to his home. When the crowds saw it, they were filled with awe, and they glorified God, who had given such authority to human beings. (Matthew 9:2-8, NRSV)
As Jesus went on from there, two blind men followed him, crying loudly, “Have mercy on us, Son of David!” When he entered the house, the blind men came to him; and Jesus said to them, “Do you believe that I am able to do this?” They said to him, “Yes, Lord.” Then he touched their eyes and said, “According to your faith let it be done to you.” And their eyes were opened. Then Jesus sternly ordered them, “See that no one knows of this.” But they went away and spread the news about him throughout that district. (Matthew 9:27-31, NRSV)
The spirit of the Lord GOD is upon me, because the LORD has anointed me; he has sent me to bring good news to the oppressed, to bind up the brokenhearted, to proclaim liberty to the captives, and release to the prisoners; to proclaim the year of the LORD’S favor, and the day of vengeance of our God; to comfort all who mourn; to provide for those who mourn in Zion—to give them a garland instead of ashes, the oil of gladness instead of mourning, the mantle of praise instead of a faint spirit. They will be called oaks of righteousness, the planting of the LORD, to display his glory. They shall build up the ancient ruins, they shall raise up the former devastations; they shall repair the ruined cities, the devastations of many generations. Strangers shall stand and feed your flocks, foreigners shall till your land and dress your vines; but you shall be called priests of the LORD, you shall be named ministers of our God; you shall enjoy the wealth of the nations, and in their riches you shall glory. Because their shame was double, and dishonor was proclaimed as their lot, therefore they shall possess a double portion; everlasting joy shall be theirs. (Isaiah 61:1-7, NRSV)
See, I am sending my messenger to prepare the way before me, and the Lord whom you seek will suddenly come to his temple. The messenger of the covenant in whom you delight—indeed, he is coming, says the LORD of hosts. But who can endure the day of his coming, and who can stand when he appears? For he is like a refiner’s fire and like fullers’ soap; he will sit as a refiner and purifier of silver, and he will purify the descendants of Levi and refine them like gold and silver, until they present offerings to the LORD in righteousness. Then the offering of Judah and Jerusalem will be pleasing to the LORD as in the days of old and as in former years. (Malachi 3:1-4, NRSV)