The book of Acts shows in a very graphic way the rapid growth and marvelous progress of Christianity in the midst of great opposition. We see in process of fulfillment the promise of Jesus Christ to his disciples that they should receive power after the Holy Ghost had come upon them and that they should be witnesses unto Him "both in Jerusalem and in all Judea and in Samaria and unto the uttermost part of the earth." Those were earnest times and full of stirring events, when men went forth to conquer a hostile world not with swords, but by the preaching of a gospel of peace and good will.