The established criterion, the foundation stone, of Christianity is Holy Scripture, the revelation of the almighty and only living God-commonly called the "Holy Bible." When accepted by faith it opens to us revealing its secrets. Its content can be clearly understood, that is, if we pursue its use by the rules it sets down for us to follow for gaining an understanding of it. Many things so-called modern Christians say are confusing, sometimes misleading, and often make no sense at all-especially to the untaught or non-Christians. What does "You must be born again, mean?" What is being "filled with the spirit." Just as importantly, what do you really know about the creation and formation of the Christ's Church? What is the purpose behind it? Does it really make sense? Does knowing the accuracy of Holy Scripture make any difference? What is the believer's part in it? How should it affect believers-and unbelievers-all of humanity? What difference does it make anyway? "This is that ... the promise fulfilled," gives an account of the Church's founding, and the instruments God uses to maintain its viability, growth, and development for the benefit of humankind. It looks at what the Church is, and how it functions. It reveals who God is, how He relates to the Church, and where He is today. It examines the Old Testament prophecy of Joel (2:17-18) that says, "It shall come to pass in the last days, saith God, I will pour out of my spirit upon all flesh." It focuses on the prophecy's fulfillment in the New Testament and discusses and how and why God created the Christian Church. Ignoring present theological concepts and denominational doctrines, it returns to the writings of the early church fathers, the language of ancient texts and various English translations and versions, in order to understand the Church's purpose and objectives in the framework of the time written. It follows each step in the process, until the promised gift of spirit became available "to all flesh (humankind)." It explains the difference between God, who is Spirit, and the indwelling gift of holy spirit, and the Scriptural difference in "baptism" and "filling" of holy spirit. It explains the gift's availability, tells why every living person needs it, and how anyone can acquire it. "This is that" is not a new approach to salvation and the spirit-filled life, it is a return to the Scriptural plan defined by the written word of God.