“Why do you not understand what I am saying? It is because you cannot hear My word. You are of your father the devil, and you want to do the desires of your father. He was a murderer from the beginning, and does not stand in the truth because there is no truth in him. Whenever he speaks a lie, he speaks from his own nature, for he is a liar and the father of lies. But because I speak the truth, you do not believe Me.” (John 8:43–45, LSB)

In the back-and-forth between Jesus and the religious leaders, Jesus made a telling comment regarding the reason behind their resistance to His teaching. These devout Jewish leaders were not representing or speaking on behalf of God as they purported. They were not God’s men, even though almost anyone within Israel would have believed that they were. They had been well-trained in the Law, the Prophets, and the Writings, and they knew the traditions of the rabbis that dated back many years. And yet, Jesus doesn’t align their teaching with God, but rather with Satan.

The root of their teaching wasn’t so much the words they said as the heart from which it emerged. The doctrine they espoused may have found its source in the Old Testament, but it never had penetrated much deeper than their minds. Their hearts were filled with murder and malice. Even though they knew what the Old Testament said and taught, their hearts twisted and ignored God’s teaching so that they were planning murder even in the face of the most unmistakable evidence of Jesus’ divinity.

Just as in the 1st Century, there are a lot of competing ideas about religion. Some incorporate truth with a mixture of folly. Others are more satanic. But even those that are closest to the teaching of Scripture, if not aligned with a changed heart given by the Spirit of God, can lead to cultic, even satanic behavior. In other words, our teaching and doctrine might be orthodox, and yet our hearts might be spewing the infectious poison of hell.

How can we know? Jesus made it clear that knowing the truth is not enough. We must believe the Word of God and not lies. When we read the Scripture and yet our lives demonstrate rebellion against the God of heaven, we ought to pause. “Do I believe, or do I merely say the right things and live in rebellion to the God I say I love?” I can’t answer that question for you, but Jesus’ words are a good reminder for all of us that it is not words versus deeds, but deeds that emerge from beliefs (however imperfect) that give evidence of what is truly in our hearts.