According to Calvinism, what is known about the character of God is limited due to the inscrutable nature of God’s being and because God does not always choose to reveal his mind. ‘Knowledge’ explains that a further limitation is located in the human heart. Due to sin’s effect on human thinking, people do not want to know the true God. Instead, people try to invent their own God and to reduce God to something manageable and fully comprehensible. The different sources of theological knowledge, according to Calvinism, are described along with the belief that the Bible is historically accurate and a reliable source for knowledge about Jesus, God, and salvation.