Today's readings are Psalm 30.3-12, Exodus 19.1-25, and Hebrews 13.1-21.
Our mourning is turned to joy. In today's readings we see the dreadful fear associated with approaching the living God. The people of Israel are not to attempt to approach God on the mountain. His glory would consume them and destroy them immediately. We ourselves cannot make adequate sacrifices to stand before God without being consumed. Yet in Hebrews we read that Jesus himself has suffered for our sin to present us to God, giving us free and safe access to God the Father. We therefore have joy. Our mourning has been turned into joy through Jesus' provision on our behalf.