About the year AD 30, Jesus sat by Jacob's well, in the dusty heat of a Samaritan afternoon. There he engaged in conversation with a sinful woman whose physical thirst was far surpassed by a deep spiritual longing. As she listened to the Man whom she would shortly recognize as the Christ, she heard the Savior speak of the Father's desire for true worshipers who would worship him in spirit and in truth. Among the many goals encompassed in God's purpose for his people there is nothing that rises higher than this. We are called to work, to watch, and to wait, but above all, we are called to be worshipers of our God. The chapters of this book consider the principles and pattern of Scripture in order to help us understand how we can ensure that God does not seek our worship in vain.