John Calvin said this about our hearts: “Man's nature, so to speak, is a perpetual factory of idols." All of us on a daily basis have a propensity to allow something or someone to rule our heart and thus our life that is not God. Whatever that thing is, the Bible says it is an idol. In fact, the reason you struggle with anger towards your wife and kids or making poor financial decisions or a constant sense of disappointment and shame is because there is some idol (or idols) that is ruling your heart. This is why Acts 19 is very important for us to understand.