When speaking of anger, the scripture uses descriptive terms that could equally be applied to the truths concerning fire. In doing so, the Bible makes a connection that can help believers gain a better understanding of the benefits or dangers of anger. According to scripture, anger can be kindled, a term used to describe the starting of a fire (Exodus 4:14; Numbers 11:1; Deuteronomy 32:22; Jeremiah 15:14), either a little (Psalm 2:12) or greatly (Numbers 11:10; 1 Samuel 11:6). The Bible also describes anger as waxing hot (Exodus 32:19), another connection to fire. These similarities are by divine design. As is true concerning fire, anger can be useful and productive, but it can also be destructive and harmful, especially when it gets out of control.
The Bible seems to point to Pharaoh most often as an example of someone with a heart hardened through sin and the deceitfulness of power and fame. Pharaoh's hardened heart led him from one rebellious act to the next. He constantly fought against the Lord and the Lord’s man. Even after all of the miracles in Egypt and the abundance of judgments, he chose to pursue the children of Israel as they departed from Egypt. Pharaoh's hardened heart led him to pursue them to the Red Sea. Out of all the troublesome effects of a hard heart, the most troubling aspect is that it refuses to hearken to the words of the Lord. On at least five occasions, the Lord makes this connection (Exodus 7:13, 22; Exodus 8:15, 19; Exodus 9:12). A hard heart closes the ears to the truth and sets the individual up for greater judgment.
