In these three passages we are given a glimpse into the Greatness of God. The door is opened to who God is, what God does, and how God loves his people and all the world. We also learn what God is not like.
In Psalm 121 we meet the God who helps his people and carefully watches over you. “the Lord will watch over your coming and going both now and forevermore.”
In Isaiah 54 God promises to rescue and rebuild the “Afflicted city,” that is a figurative description of restoring Jerusalem. It’s an image of bringing Israel back from captivity in foreign nations. When God protects you, you need not fear, for “tyranny” and “terror will be far removed.” God accomplishes what he declares.
In Acts 17, Paul speaks to people in Athens, actually learned people in the meeting of the Council of the Areopagus. They presided over the religious and moral teaching of Athens at that time.
Paul reminds them that God is great, “24 “The God who made the world and everything in it is the Lord of heaven and earth and does not live in temples built by human hands. 25 And he is not served by human hands, as if he needed anything. Rather, he himself gives everyone life and breath and everything else.”
In fact, the one true God is so great that he raised “the man he has appointed,” that is Jesus from the dead. And everyone (the world) will be judged “with justice by the man he has appointed,” which is Jesus.
This day look out at the world and the people whom you see and remember that God helps us, that God created all things, and that Jesus died and rose again for us. The standard for a life, well lived, faithfully lived is Jesus. One day God will bring history to a close and judge, that is, make an assessment of how we have lived. The standard is Jesus. When we are a follower of Christ Jesus we receive the grace of God to cover all of our sins. In Jesus, the greatness of God, is most fully revealed.