What does the Bible say about hardening our hearts?

The Bible cautions believers not to harden their hearts against God's voice, particularly in Hebrews 3:7-11, which echoes Psalm 95. It highlights that such hardening leads to spiritual disobedience, and those who turn away from God's call face severe consequences, including exclusion from His rest. The author points out that the Israelites provoked God in the wilderness by doubting His promises, which serves as a warning for us today to remain sensitive to the Holy Spirit's guidance and not to dismiss God's commands.