This Sunday happens to be Pentecost. It changes every year because Easter changes every year, and it is essentially fifty days after Easter.
The first thing most Christians think about on this Sunday is the Pentecost experience in Acts 2. But that is an easy way to get distracted from what is important.
The writer of Acts starts the book by noting that the first volume (the Gospel according to Luke) describes what Jesus began to do and to teach. By implication this volume is what Jesus CONTINUES to do and to teach.
Those who have heard me preach for a while know that I usually preach on the Gospel text, and there is a good reason for that. The focus is usually Jesus. It is difficult to have the focus be anything else.
The Gospel text for this year, from John 7, only verses 37-39. And the first part of the ESV text reads in this way (and most translations follow): "On the last day of the feast, the great day, Jesus stood up and cried out, 'If anyone thirsts, let him come to me and drink. Whoever believes in me, as the Scripture has said, "Out of his heart will flow rivers of living water."'"
But there is a footnote which has the translation as follows, and I think this option helps to keep the focus on Jesus: "On the last day of the feast, the great day, Jesus stood up and cried out, 'If anyone thirsts, let him come to me, and let him who believes in me drink. As the Scripture has said, "Out of his heart will flow rivers of living water."'" With this second option, the heart with the rivers of living water is Jesus' heart.
This second option also fits with the important action of Jesus' crucifixion, that when he was pierced, out came blood and water. John was there. He saw the details. He may have not seen the big picture right away. But when it came later, I am quite sure he was impressed.
In Acts 2 the disciples are telling 'the mighty works of God.' I would imagine that they are not talking about creation. The whole story that God has chosen to reveal is about something infinitely more important.