While Peter wanted to build tents for Elijah, Moses, and Jesus on top of the mountain, he was frozen in fear as the Spirit of God laid upon them. It is not always necessary for action to take place, but instead, observation and worship can be what is necessary. There is no reason for the faithful to fear circumstances, for God approaches them with His love, mercy, and grace. Bask in His presence, and His ordained will becomes clear. Sometimes, He wants us to learn from Him so that we may grow in our spiritual lives and our faith.
Robert H. Stein’s Studying the Synoptic Gospels: Origin and Interpretation is an excellent work that is in its second edition, which provides an excellent introduction to the scholarship concerning the synoptic problem. It goes deep enough into the studies of the Synoptics to satisfy experienced theologians while remaining comprehensible to the uninitiated reader. The bulk of the book is focused upon Stein’s proposed solution that Matthew and Luke used Mark plus the hypothetical Q material to write their gospels.