Why do people murmur? What causes them to get so frustrated to the point where they would publicly discuss their disappointment with their circumstances? The Bible provides several reasons. In Jude 16, the Bible says that people complain or murmur because they are “walking after their own lusts.” In John chapter 6, the Lord Jesus indicated another reason why an individual might complain. When the Lord knew that His disciples murmured within themselves, He asked them if they were offended (John 6:61). In other words, people murmur when things turn out differently than they had hoped. It is not so much the trial that bothers them but the offense to their self-will.
The Bible admonishes believers to be stedfast and unmoveable (1 Corinthians 15:58). We are to be grounded and settled (Colossians 1:23) in the faith—much like a tree planted by the rivers of waters (Psalm 1:3). Yet, today's passage points to the dangers of a hardened heart set in rebellion. It is likened to a stone and a millstone. We should remain stedfast in our commitment to serve the Lord, yet our hearts should remain tender and pliable to Him and His will. A stony heart hinders the seed of God’s word from taking root (Matthew 13:5-6). This hardness hinders the possibility of spiritual fruit from taking root and maturing. A soft heart and a stedfast walk exhibit the godly balance that God desires for each of us.