Heart and Mind: Controlling Behaviors

The “heart” that we often hear mentioned in the Bible functions as the inner system that governs our thoughts, reactions, and behaviors.  In modern language, this role corresponds closely to what is often called the “subconscious mind”.  Though separated by centuries, cultures, and languages, both terms describe the same concept: the hidden place where thought patterns are stored and where action is calculated prior to outward behavior.

Proverbs 23 states, “As a man thinks in his heart, so is he”, suggesting that life is shaped by internal programming rather than by momentary decisions.  In other words, people act out of what they carry deep within them.  Scripture also acknowledges that the heart is largely hidden from conscious access.  In Romans, the apostle Paul writes, “I do not understand what I do.”  He explains that he often acts against his own desires for doing good work.  Individuals tend to be unaware of their own motives and are usually unable to explain their own responses.  This aligns with the recognition that the majority of life operates outside of conscious awareness.  Jesus teaches in Matthew 15 that a wide range of sin comes “out of the heart”.  He does not describe sinful behavior as a sudden failure of choice, but as an outward expression from an internal toxic source.  

Notice that the Bible tells us in Proverbs 4:23 to “guard your heart”, not to “control your heart”.  This highlights the fact that we cannot consciously control our subconscious mind.  We are, however, told to control what enters into it.  Whatever is repeatedly experienced, embraced, or tolerated settles into the heart and begins to guide future responses automatically… beyond our conscious control.

Scripture’s solution to this problem is not more effort or willpower, but a renewed heart.  The promise of “a new heart” in Ezekiel 36:26 points to change at the deepest level of the person.  This is not instant moral perfection, but a gradual reshaping of inner orientation.  Over time, this inner transformation manifests in changed desires, choices, and patterns of life.  Romans 12:2 tells us to, “… be transformed by the renewing of your mind.”

Viewed through the lens of mental health, the Bible offers an early and remarkably accurate model of mental functioning.  It shows that lasting change requires attending to the inner structures that shape our perception.  Guarding and renewing the heart parallels modern therapeutic goals of increasing awareness, restructuring maladaptive patterns, and fostering healthier internal narratives.

To live wisely, we must carefully manage what enters our subconscious mind.  For this reason, the Bible tells us to fill our hearts with truth, wisdom, and gratitude so that automatic behaviors are shaped by well-regulated emotional responses. By cultivating our heart in this way, our inner life gradually aligns with God’s desire for us, leading to more consistent, righteous behavior.  This may sound daunting, but we have help.  Philippians 4:7 tells us, “And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus.”