Suddenly

Malachi 3
"And the Lord whom you seek, shall suddenly come to his temple."

We are being prepared for the "suddenly" realm.

Luke 2:13
"Suddenly there was with the angel a multitude of the heavenly host."

This was at the incarnation of Jesus as the Word being made flesh into this earth.

Acts 2
"And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled the whole house in which they were sitting."

Pentecost - this was the incarnation of Christ Jesus appearance as Spirit into his disciples and this world.

Acts 9
"Suddenly there shone from heaven a great light round about me.  And he fell to the ground."

This was Paul's first encounter with Jesus Christ in his glorified Light Form appearing to him and speaking to him.

Our Lord's appearance is as the thief in the night....this long dark night of man will be pierced "suddenly" by the Light of His appearance within his saints.
"He is coming to be glorified in His saints."