This article explains the difference between original sin and actual sin. In explaining original sin, the author includes in the discussion such subjects as the covenant of works and the covenant of grace. In the second part, the nature and evidence of original sin is discussed. In the final section, the author discusses the punishment of sin, which includes death in its three forms and the moral state of sinful man.

This article starts with a discussion on the relationship between the covenant of redemption and the covenant of grace, arguing that there is no material difference between them. He then focuses on the covenant of grace, refuting non-Reformed teachings that have emerged on this doctrine. The author emphasizes that this covenant follows the covenant of works in history, and that it does not do away with the responsibility of man.

This article attempts to explain the doctrine of election. The explanation includes the definition of election, in which the role of Christ is crucial. A number of characteristics of election are given, such as its occurence in eternity, and there being only one decree. The discussion also refutes those who understand election differently, such as Pelagians and Romanists. Reprobation and the cause of sin are also discussed.

This article explains the relationship between original sin and actual sin, pointing out that actual sin is the fruit of original sin. It also discusses God's punishment of sin.

The doctrine of the Trinity seeks to explain that God exists in three persons, and every person is fully God, yet there is one God. This article explains the biblical grounds of this claim.