Isaiah 48:4 (KJV) says, "Because I knew that thou art obstinate, and thy neck is an iron sinew, and thy brow brass."

This verse comes from the book of Isaiah, which is a prophetic book in the Old Testament of the Bible. The prophet Isaiah was called by God to deliver messages to the people of Judah, warning them of the consequences of their disobedience and calling them to repentance. This verse is a part of God's message to the people, pointing out their stubbornness and resistance to his will.

The verse begins with the phrase, "Because I knew that thou art obstinate," indicating that God is aware of the character of the people to whom he is speaking. The word "obstinate" implies a firm, inflexible, and unyielding attitude, indicating that the people were resistant to God's guidance and unwilling to change their ways. This stubbornness is a recurring theme throughout the book of Isaiah, as the prophet repeatedly admonishes the people for their arrogance and self-reliance.

The next part of the verse states, "and thy neck is an iron sinew," which further emphasizes the people's stubbornness. In ancient times, the phrase "iron sinew" would have been understood as a metaphor for a rigid and unyielding neck, highlighting the people's unwillingness to bow down to God's authority. This imagery conveys the idea of a stiff neck that cannot be easily turned or bent, suggesting a sense of pride and defiance.

The verse concludes with the statement, "and thy brow brass," which further emphasizes the people's hardness and unwillingness to submit to God. The term "brass" conveys the idea of hardness and strength, suggesting that the people's hearts and minds were resistant to God's admonitions and calls for repentance. This imagery of a brass forehead symbolizes the people's refusal to acknowledge their sins and their stubborn refusal to change their ways.

In this verse, God is addressing the people's resistance to his will and their refusal to acknowledge their need for repentance. The imagery used in the verse conveys a sense of hardness, stubbornness, and arrogance, highlighting the people's refusal to submit to God's authority and their unwillingness to change their ways.

The broader context of the book of Isaiah also sheds light on the meaning of this verse. Throughout the book, Isaiah prophesies about God's judgment and salvation, calling the people to repentance and warning them of the consequences of their disobedience. The theme of stubbornness and resistance to God's will is a recurring one, as the prophet confronts the people with their arrogance and self-reliance, urging them to turn back to God.

Ultimately, this verse serves as a powerful reminder of the consequences of pride and disobedience. It is a call to humility and repentance, urging the people to soften their hearts and turn back to God. The imagery of a stiff neck and a brass forehead serves as a powerful metaphor for the hardness of the people's hearts and their unwillingness to submit to God's will.

In conclusion, Isaiah 48:4 is a powerful and evocative verse that highlights the theme of stubbornness and resistance to God's will. It serves as a call to humility and repentance, urging the people to soften their hearts and turn back to God. The imagery of a stiff neck and a brass forehead conveys a sense of pride and defiance, emphasizing the consequences of disobedience and the importance of submitting to God's authority.