As for this first book, each topic of the books explains the following matters: Human Life PriorityThe writer thought of this topic because when he came to a funeral, a question would often pop up: "Actually, what is a human being's main task in this life?" And it turned out that it has also been thought over by Solomon and discussed in the book of Ecclesiastes.The Value of SalvationMany God's children falling away; they give up their faith and become followers of another religion due to persecutions, positions, wealth, and life partner, and one of the main reasons is because they do not know how invaluable the salvation they have gained when they accept Jesus Christ as their Lord and Savior.The Rights and Responsibilities of God's ChildrenAs Christians, we are God's children. However, we often assume those terms "children of God" and "Father" just as "titles" not as "status". That's why we are less aware that we truly have the status or position as God's children with their rights and responsibilities. We would be overwhelmed when we know how wonderful the rights God gives us as His children.The Foundations of ChristianityWe often heard of some Christians or even activists who were amazingly diligent in serving the Lord, suddenly left their faith for another belief. How could this happen? One of the main reasons is that their foundations of faith were not strong. Therefore, this topic is very important and fundamental for us to comprehend and possess.The Characteristics of Children of God, We know that the ones who will go to Heaven are God's children, not merely people who like to go to church. Therefore, it is important for us to know whether we are God's children, because if we turn out not to be His, then we will go to hell. The Lord Jesus describes in detail the characteristics of God's children.4 Types of ChristiansThe Parable of the Sower explains about four types of Christians where only the fourth types who will survive. Therefore, we need to study them while looking at which type of Christian we are today. If we are not yet the fourth type, then we must immediately change ourselves, so that we can enter the kingdom of God.Jesus versus MammonAs we live in an age wealth and riches are idolized like today, it is necessary for us to know what the characteristics of Christ's followers are referring to money or wealth. If mammon becomes primal in our lives, we will expel our Lord Jesus Christ from our hearts.The Great CommissionThe phrase" in Jeru