.Luke 9:18-22 has an impressive command. Peter has correctly stated that Jesus is Messiah, the Christ, the anointed one of God. Immediately Jesus commands the disciples not to tell anyone. Why not? It is because Jesus must suffer, be rejected, and die. Then raised from the dead. If Jesus wanted this widely know at that point in his ministry, He would be bragging.
How about us? Do we seek attention for the unique things God has done for us? Maybe we should not. Who knows but what we too, like Jesus, have many things to suffer, rejection to face and even killed. When we brag about a special relationship with God, The name of God will be slandered when we suffer? People will think that either we have lied about this relationship or that God is not able to protect His own.
We should keep quiet when God shows himself to us in unusual ways. Or He uses us to do His work in some unique way. For we do not know what will happen in the future.