Doctrine means a set of beliefs or teaching. Theology in the Christian context refers to the study of different doctrines in the attempt to know God's nature more fully. Although there is a great deal of common ground in beliefs between different Christians, since the church formed, major events and conflicts over matters of doctrine have resulted in significant rifts in the church. Various Creeds and catechisms have been written as statements of the beliefs of different Christians. Today, although Christians agree that there is a loving tri-une God and that Jesus, the Son of God, died for the sins of humanity and rose again to new life, there are still considerable differences in understanding on major themes including justification, salvation and grace.