This Book number 3 is a summary of some of the key teachings of the Lord Jesus Christ in conjunction with Book number 2("Teachings of Jesus Christ") as part of a series of books by the author to reveal the teachings of the Lord Jesus Christ as the CORNERSTONE teachings concerning the kingdom of the God and the gospel of salvation. Most of the writings by "Christian authors" available in "Christian bookstalls" revealing the gospel of salvation and the kingdom of the God were interpreted mainly from the teachings of the apostles and prophets. The clear and specific teachings of the Lord Jesus Christ had/have not been revealed as the CORNERSTONE upon which all the teachings of the apostles and prophets should be based upon. Because of this, many "Christian theologians and authors" had/have not correctly interpreted the teachings of the apostles and prophets, in particular the teachings of Paul. This has contributed to the establishment of many "Christian sects" with many variations of understanding of the gospel of salvation and the kingdom of the God. This Book number 3 should be read together with Book number 2(Teachings of Jesus Christ) and Book number 5("Two important Greek words frequently used by the Lord Jesus Christ and His disciples in their teachings and preachings concerning "poieo" and "ergazomai.") to enable the reader to have a more complete understanding of the gospel of salvation and the kingdom of the God based upon the CORNERSTONE teachings of the Lord Jesus Christ. With understanding of the CORNERSTONE teachings of the Lord Jesus Christ believers will be able to return to follow the true Lord Jesus Christ or be able to obey the true gospel of salvation to make sure their election to everlasting life. The believers will be able to detect any incorrect interpretation by other preachers and "church organizations" concerning all aspects of the gospel of salvation taught by Paul and the other apostles and prophets. This Book number 3 reveals some key aspects of the teachings of the Lord Jesus Christ about the gospel and the kingdom of the God and their links to subjects such as: disciples; distinction between Old Testament and New Testament saints; parables of the kingdom of the God; works (good and evil); doing the will of the God; love and the love and to love; righteous. good, unrighteous, evil and corrupt; promise of the Holy Spirit; worship; everlasting life and everlasting death; mystery of divinity. Readers are urged to test the content in this Book against the unadulterated word of the God (the original texts of the New Testament) to prove and/or to disprove its veracity.