From the “New Spirit Filled Life ” Bible, New King James Version: Hebrews 4:2,7,12:
“For indeed the gospel was preached to us as well as to them; but the word which they heard did not profit them, not being mixed with FAITH in those who heard it.”
“Today, if you will hear His voice, do not harden your hearts.”
“For the Word of God is living and POWERFUL, and sharper than any two-edged sword, piercing even to the division of soul and spirit, and of joints and marrow, and is a discerner of the thoughts and intents of the heart.”
FOOTNOTES: Hebrews 4:10: (The PROMISE of REST requires FAITH.)”Just as God rested from His work of creation, the one who trusts in Christ rests in what God has done for him. He has ceased striving to achieve salvation by his own efforts, and in daily life has begun to learn a dependence upon the Holy Spirit’s help.”
Unbelief is caused by a hardened heart, which is caused by the deceitfulness of sin.