The Bible describes the Israelites as stiff-necked, a term used five times in the Old Testament, as seen in Deuteronomy 31:27 where Moses says, For I know your rebellion and your stiff neck. If today, while I am yet alive with you, you have been rebellious against the LORD, then how much more after my death? A stiff neck illustrates stubborn rebellion, derived from the imagery of refusing to bow the head in honor or submission, which at its worst signifies outright defiance. The effects of a stiff neck are telling. Physically, it causes pain ranging from a frustrating ache to intense discomfort, limiting the natural motion of the neck and making every movement hurt. Spiritually, stubborn rebellion against God brings similar pain, resulting in curses for disobedience that cause suffering. Additionally, a stiff neck is debilitating, restricting normal movement and actions, much like a spiritual stiff neck limits a person to contrary choices, unable to freely choose right until repentance occurs. Lastly, a stiff neck creates tunnel vision, preventing one from seeing beyond what is directly ahead, akin to a Christian whose obstinate disobedience narrows their perspective, often focusing solely on personal grievances rather than God's broader work. The key lesson is to avoid a spiritual stiff neck by remembering our place before the great God we serve, as expressed in Isaiah 64:8-9: But now, O LORD, You are our Father; we are the clay, and You our potter; and all we are the work of Your hand. Do not be furious, O LORD, nor remember iniquity forever; indeed, please look we all are Your people! Keeping this distinction clear ensures our heads remain bowed and our necks never stiff.

An uncircumcised heart is closed and impervious to God's efforts to influence it, producing resistance that Scripture identifies as being stiff necked. This condition manifests as an unyielding attitude in which the head, jaw, ears, and mouth are set against submission, so that the person hears the Word of God imperfectly, rejects it through prejudice, or refuses it outright. The same resistance appears in uncircumcised ears that filter truth according to personal preference and in uncircumcised lips that speak it inaccurately through ignorance or deception. Deuteronomy 10:16 therefore commands, "Circumcise therefore the foreskin of your heart, and be no more stiff necked," placing responsibility on the individual to yield. This human action cooperates with God's supernatural circumcision of the heart, which removes the obstructing flesh and renders the mind pliable and amenable to His Word. The result is genuine submission expressed in consistent obedience to the law rather than mere external conformity. When the heart remains uncircumcised, even those who possess the covenant sign live as though they were outside the covenant, bringing dishonor on God by teaching one standard while practicing another. Baptism, the New Covenant counterpart to circumcision, carries the same requirement: outward participation is rendered meaningless if the heart does not produce transformed conduct. Thus the topic of stiff neckedness is inseparable from the larger purpose of the New Covenant, which supplies the Spirit and writes the law on the heart so that worship occurs in spirit and truth and the believer is enabled to go on to perfection.

Stiffneckedness emerges in the material as a biblical symbol of resistance to God, directly linked to an uncircumcised heart that remains closed and impervious to divine direction. The phrase first appears in Deuteronomy 10:16, where the command to circumcise the foreskin of the heart is immediately followed by the instruction to be no more stiffnecked. This connection portrays stiffneckedness as the outward attitude that results when the inner hindrance of an uncircumcised heart is not removed. The same imagery reappears in Acts 7:51, where Stephen addresses the Jews as stiffnecked and uncircumcised in heart and ears, accusing them of always resisting the Holy Spirit just as their fathers had done. An uncircumcised heart therefore produces the practical effect of stiffneckedness: when God speaks, the person gets the back up in antagonism, rejecting truth out of hand or hearing it only through strong prejudice. The material presents this resistance as the very evidence of carnality that Romans 8:7 describes, an enmity that cannot be hidden and that inevitably surfaces in opposition to God's law. By contrast, the circumcision made without hands removes what hinders, rendering the heart pliable and submissive to God's will. The broader message ties this directly to the responsibility of living by every word of God, since any attitude that treats portions of Scripture as done away fosters the same stiffnecked refusal to submit.