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.
Reading commentaries offers varying opinions concerning the definition of purity. However, the Bible offers some exacting details which give the right definition. Today's passage speaks of the “pure blood of the grape.” In other words, nothing was added to the juice—it was pure. There are several other substances in scripture identified as pure: gold (Exodus 25:39), olive oil (Exodus 27:20), myrrh (Exodus 30:23), incense (Exodus 37:29), and language (Zephaniah 3:9). Each instance emphasizes that nothing exists to corrupt the nature of the original. These substances are not combined with other materials to dilute or defile them. In essence, purity demands the absence of any substance that corrupts, defiles, or taints in any way.