The former treatise] i.e. St. Luke's Gospel: see Intro. Theophilus] see on Luke 1:3.
Began] The Gospel records the work that Jesus began to do. Acts records its accomplishment. The chief agent in this book is the Ascended Christ Himself, operating through His Spirit, and performing works which were not possible while He was still in the flesh (John 14:12).
2 Through the. Holy Ghost] St. Luke represents all the actions of Christ's ministry as performed by the power of the Holy Spirit, which He received at His Baptism to consecrate Him to His office of Messiah: see Acts 10:38. Commandments] viz. to preach repentance and remission of sins to all nations beginning at Jerusalem, and to tarry in the city until they should be endued with power from on high (Luke 24:47.).