Luke wrote the Acts of the Apostles.
He had written to Theophilus before, most probably the Gospel according to Luke. In that book, he had written an orderly account about the Lord Jesus Christ, to convince Theophilus of the certainty of the Gospel of Christ.
The Gospel of Luke is about all that Jesus began to do and to teach. It is about the coming of the Kingdom of God. It is about the work of salvation through the finished work of the Lord Jesus Christ on Calvary. It is about the work of the Holy Spirit in relation to our Savior. It is about faith and devotion to Jesus Christ, and the Cost of Discipleship. It is about the great Commission. It is about the fulfillment of the OT prophecies. It is about the love of the Father.....
The Lord Jesus Christ was taken up to heaven after His suffering and death on the Cross, after He had conquered death and Satan's hold of our lives. The Lord Jesus Christ was taken up to be with God the Father in Heaven.
The world is coming to the end. The last Judgment is approaching. The Lord Jesus Christ will come again in Glory. He will triumph over all His enemies.
Meanwhile, the Holy Spirit is with us, guiding us into all truths, bringing us the blessings of Heaven, helping us in our spiritual battles, protecting us, teaching us, comforting us, proving our faith genuine, ......
Church leaders are to continue the work. The people of God are to be gathered. The Church of God is to be established. Light must continue to shine in the Darkness. Missionaries all over the world are making disciples. The night of darkness is coming, when no one can work.
Light penetrates Darkness.