Kaleb begins his sermon series on Acts by preaching on Acts chapter 1. He tells us that after Jesus was resurrected, he returned to be with his disciples for forty days until he ascended. Before he ascended, he promised them the power of the Holy Spirit, but before they receive it, he commanded them to wait. Kaleb stresses the importance of this period of waiting, that it gives God the authority and gives us a chance to unite as one mind, devoted to prayer.