The [1]purpose of S. Luke in writing the Acts seems to have been to set before us the labours and sufferings of the Apostles in planting and propagating the Church. But he has divided the book very distinctly into two portions; the latter, from the thirteenth chapter to the end, with one short exception, is wholly occupied with the labours of S. Paul, "the vessel of election," in spreading the faith among the Gentiles, and so contains the particular history of that Apostle, and the churches founded by him. The former, from the beginning to the end of the twelfth chapter, embraces the history of the Apostles in common, and of the whole Church, as it rose at Jerusalem, and was spread first in Judea, then in Samaria, and finally extended to the Gentiles. The former history, then, is universal; the latter, particular. Moreover, to use the words of [2]S. Chrysostome, "we may here see the promises which Christ made in the Gospels carried into execution, and the bright light of truth shining in the very actions, and a great change in the disciples, arising from the Spirit that had entered into them.--You will see here Apostles speeding on the wing over land and sea, and men once timid and unskilled suddenly changed into despisers of wealth, and conquerors of glory and all other passions; you will see them united in the utmost harmony, without jealousy, which once they had, without contention for the higher place." We may say, then, in a word, that the Gospels are a history of the Head, and the Acts of the mystical Body. Hence both issue forth from one and the same fountain and source. The history of the Head begins with the descent of the Holy Ghost, whereby Christ was conceived, and [3]"the race of God and of man became one. For just as the union of man with woman joins two families, so upon Christ assuming flesh, by that flesh the whole Church became of kin with Christ, Paul became Christ's kinsman, and Peter, each one of the faithful, all we, every holy person. Therefore, says Paul, [4]'being the offspring of God,' and again, 'we are the body of Christ and members in particular,' that is, through the flesh, which He has assumed, we are His kinsmen." Now the history of the Body, proceeding from the same fountain-head, sets before us the Holy Spirit, who, by descending first on the teachers, and afterwards on the disciples, exalts and advances all, and by imparting Himself, imparts "the proportional deification of man," that is, "the utmost possible assimilation and union with God."[5] For "the Spirit works in us by His proper power, truly sanctifying, and uniting us to Himself into one frame, and making us partakers of the divine nature:"[6] "becoming as it were a quality of the Godhead in us, and dwelling in the saints, and abiding for ever."