"You stiffnecked and uncircumcised in heart and ears! You always resist the Holy Spirit; as your fathers did, so do you." (Acts 7:51)

In ancient cultures, the ox was commonly used to plow fields and pull carts. These animals were hard to handle under the best of circumstances. When an angry ox stiffened the muscles of his powerful neck, it was difficult or impossible to guide him. Those ancient people began to use the term "stiff-necked" to refer to people who were stubborn and self-willed like the oxen. It is so used in the word of God.

Let us not be stubborn or self-willed, but humbly yield to the revelation of the Holy Spirit.