The brief study of the Acts which follows is really no more than a first glimpse into a land of promise. It is the announcement of a discovery made by the writer that this narrative is a revelation of the Holy Spirit in his relations to believers as Christ’s witnesses, and to the church as the witnessing body; and that, from the opening chapter on, there is a progressive unfolding of this great theme, which it is our humble endeavour to trace. Nothing is claimed for what follows, save a suggestion; like all discoveries, it needs confirmation by a fuller examination and more thorough exploration. But if the hints herein found shall prove grapes of Eshcol, tempting others, who are more competent, to search this goodly land more successfully and thoroughly, and lead God’s people to its more thorough occupation and enjoyment, the desire and purpose of the author will be fulfilled.