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Many ancient and modern civilizations believed that the heart had a function that went beyond simply pumping blood through a person's arteries—a function connected to thoughts and emotions—and that the most delicate feelings were born in the depths of the heart.
Prior to Dr. J. Andrew Armor's 1991 discovery[1] that the heart had its own "internal cardiac nervous system" or "little brain," modern science initially saw the heart as nothing more than a pump to control blood flow within an organism's body.
The heart has its own nervous system and is more than just a blood pump because of this "heart brain," which is made up of about 40,000 neurons that resemble those in the brain. In fact, the heart communicates with the brain more than the brain communicates with the heart, which has an impact on memories, emotions, and problem-solving abilities. Since the heart's neural network is so sensitive, positive emotions like love and joy cause our heart rhythms to become highly ordered. In contrast, negative emotions cause heart dysfunction and irregularity, which results in inefficiency, low energy, and feeble thinking.
According to the most recent medical research, the heart communicates with the brain in four ways, namely:

1- Nervously: via nerve impulse transmission,
2- Biochemically: via hormones and neurotransmitters,
3- Bio-physically: via pressure waves,
4- Electromagnetically: via interactions of the electromagnetic field between the heart and the brain.

The heart and the brain are constantly communicating. During this conversation, our emotions translate the brain's signals to the heart, and the heart responds in complex ways. Furthermore, research indicates that the messages sent by the heart to the brain can affect our intellectual and moral performance, and in psychology, the ste***astness of the heart is defined as the calmness of the soul that leads to complete control over one's mental powers, sensory abilities, feelings, behavior, and actions

The lower curve represents the heartbeat, while the other three curves represent the brain's reaction to the heartbeat.

In the dialogue between the mind and the heart, the two may disagree, so who will win in making the correct decision? Life frequently places us at the crossroads of more than one path to choose from among the best, which may be fateful and decisive, and here the mind emerges to present many reasons that appear convincing at first glance, but the judgment according to the mind is faced with various obstacles; i.e., the mind action is based primarily on circumstantial knowledge, which changes with time and place.
Without the immediate sense of the heart, there would not have been the great discoveries that altered the course of history. Einstein, a brilliant scientist who developed the general and special theories of relativity that continue to confound scientists, has in fact stressed the significance of this kind of knowledge numerous times. Considering that the heart has an electromagnetic field that is 5000 times more intense than the brain's and 60 times larger in amplitude than the brain's, we will find that our decision is correct when we listen to our hearts and believe that their logic, whether mental or otherwise, underlies it. Stanford University and Oxford University studies on this subject show that: the heart is a state of intelligent consciousness.
Since the heart has its own pacemaker, it can function completely independently of the brain. We can even measure minute variations in heart rate to demonstrate how sensitive the heart is to changes in the organism without going back to the brain. These variations are referred to as heart rate variability or heart rate volatility (HRV).
The heart continues to beat as long as it is supplied with oxygen: if removed from the body, placed in a saline solution, and supplied with oxygen, it will continue to beat despite the death of the brain, whereas the opposite is not true: if the heart does not supply it with blood, the brain dies within a few minutes. Experiments have shown that due to the functional memory of the heart cells, 10-15% of recipients of heart donation experience changes in their tastes, personalities, and memories related to the original heart's owner that was transferred to them.
The most renowned instance involves an 8-year-old girl who underwent a heart transplant from a 10-year-old girl tragically killed. Following the surgery, the young recipient began experiencing haunting nightmares of being pursued and harmed by an unknown man amidst the shadows of the forest. Astoundingly, these vivid dreams led authorities to the apprehension of the perpetrator, as the details divulged by the child provided crucial clues that ultimately cracked the case.
Aligning the function of the brain of the skull and the function of the brain of the heart could reveal impressive positive health and social outcomes. Similar to tuning a radio to a frequency that produces optimal listening for the channel we're looking for, we try to achieve one such harmony. The magnetic field that connects these two brains operates in perfect harmony at a frequency of 0.1 Hz. The harmony of this frequency has been scientifically proven to activate enzymes that delay aging, improve cognitive function, enhance immunity, and increase the production of (DHEA Dehydroepiandrosterone), the most abundant steroid hormone in the human body, also known as the happiness hormone. By regulating the rate of change in heartbeat (HRV), the harmony between the heart and the brain leads to greater flexibility in adapting to life variables and dealing with the stresses that we face in our daily lives, and this effect extends to others. The emission of frequencies induced by a state of harmony was measured, it turns out that it can be captured within a circle with a diameter of about 1.5 meters. But how can this balance be achieved?
The solution lies in the desire to outperform oneself. A person whose reasoning is limited to logic and the mind of the brain will become mentally ossified and will not discover himself. When a person is free of the repeated emotional negative experiences of envy, wrath, fear, and greed, he enters a world of self-discovery, which frees him from the prison of time and transient material need. Although logic is the foundation of intuition and creativity, it cannot initiate invention on its own.
The individual is not the only one who is dependent on the creative energy that pushes him forward; society is also dependent on that energy. Societies, and thus civilizations, develop and thrive or deteriorate based on the creative energy that characterizes their elite, and this energy is related to man's free will, but development and progress cannot represent a final goal in and of themselves unless we specify the end of it. Rather, life is nothing more than a quest for God in an attempt to transcend nihilism and reach the sublimity of the immortal soul.
The confinement of rationality to material aspects of knowledge deprives it of the creative spiritual power that is required for the survival and transcendence of the human race. Without this critical realism, the term "progress" is meaningless, like a car without fuel.

The Holy Quran, in its divine wisdom, posits the heart as the seat of intellect, a luminous beacon guiding us towards virtuous deeds. This profound truth is beautifully encapsulated in Surah 22, Verse 46. Allow me to present an eloquent rendition of this verse:
“Do they not traverse the earth, possessing hearts that reason and ears that hear? Indeed, it is not the eyes that are rendered sightless, but rather the hearts ensconced within the breasts that are truly blind.”

[1] . Deborah Rozman, Let Your Heart Talk to Your Brain, Huff post, 02/11/2013 09:28 am EST | Updated December 6, 2017.