True intelligence does not need quick certainties
We live in an age that rewards immediate responses. Everything pushes toward simplification: good or bad, true or false, with me or against me. Social media rewards instant reactions, and information overload is gradually eliminating pauses. A nervous system saturated with stimuli is increasingly intolerant of ambiguity.
That's why one of the most sophisticated and rarest cognitive abilities today is the capacity to sustain complexity without collapsing into a premature conclusion. Psychology has a name for this: Janusian thinking, the ability to simultaneously hold two seemingly opposing ideas without losing mental clarity, emotional regulation, or the capacity to function.
The term was coined by Albert Rothenberg (1971), a psychiatrist who spent decades studying the cognitive processes of highly innovative scientists, artists, and creators. The name comes from Janus, the Roman god with two faces looking in opposite directions. Rothenberg observed that many profound forms of creativity arose precisely from the ability to unite contradictory elements that the conventional mind would consider incompatible. Years later, he investigated Nobel laureates renowned for their creativity and found in them this same paradoxical way of processing information.
Janusian thinking is an advanced form of cognitive flexibility, structured and rigorous, and probably one of the most mature expressions of psychological intelligence. It functions as a trainable skill, available to anyone willing to endure the discomfort it entails.
The mind seeks certainty because active uncertainty threatens
The inability to tolerate ambiguity has a physiological as well as an intellectual root. A dysregulated nervous system needs quick certainty because uncertainty is experienced as a threat.
Psychologist Else Frenkel-Brunswik (1949) was the first to describe this difference as a personality trait. She studied what she called intolerance of ambiguity and defined it as a tendency to resort to black-and-white solutions, making hasty and overconfident judgments, often at the expense of reality. Her work revealed something unsettling: people who cannot tolerate ambiguity tend to think more rigidly.
When the nervous system cannot tolerate ambiguity, the mind stops exploring and begins to defend. It defends identity, narrative, ideology, ego. At that moment, mental activity has shifted from thinking to protection. This is the point where thinking begins to deteriorate, due to excessive urgency rather than a lack of capacity.
Most people react before they think
This is constantly seen in difficult conversations. Someone hears an uncomfortable idea and responds immediately. There's hardly any processing, hardly any reflection. The priority is to restore internal security as quickly as possible.
That's why so many people need an instant opinion on everything, feel uncomfortable saying "I don't know," confuse certainty with intelligence, and experience any contradiction as a threat to their identity. Sophisticated thinking operates at a different pace. Cognitively more mature people tend to take longer to reach conclusions because they can consider several possibilities simultaneously without the urgent need to finalize their reasoning.
Janusian thought contains the contradiction
Carl Jung understood this profoundly when he spoke of the tension of opposites within the psyche. For Jung, mature psychological development required something more difficult than eliminating internal polarities: learning to consciously hold them. Strength and vulnerability. Autonomy and the need for connection. Ambition and rest. Individuality and belonging. Control and surrender.
The immature mind chooses one pole and denies the other. The integrated mind can contain both, and this requires enormous nervous and emotional capacity, because sustaining the contradiction generates internal tension. It is precisely there that profound thought is born.
Jung expressed it with a phrase that is worth reading slowly: “Great energy is born from an equally great tension between opposites.” (1967). Authentic creativity often emerges from that unresolved tension.
Cognitive flexibility is a form of nervous regulation
Cognitive flexibility depends directly on the regulation of the nervous system. A brain in a chronic state of threat loses complexity: the amygdala takes precedence, thinking becomes rigid, black-and-white thinking increases, perspective narrows, and the capacity for mentalization diminishes.
Daniel Siegel's interpersonal neuroscience (1999) has shown how states of emotional hyperarousal reduce the integration between the prefrontal cortex and the limbic systems. In other words, when you are physiologically dysregulated, thinking with complexity becomes much more difficult. Many heated arguments are cognitively poor because too many nervous systems are saturated at once, even with the available information intact.
Clinical psychology has attempted to measure this capacity. John Dennis and Jillon Vander Wal (2010) developed a widely used instrument to assess cognitive flexibility, understood as the ability to question and replace rigid thoughts with more balanced and adaptive ones. Their research points in a clear direction: people with greater cognitive flexibility cope better with difficult events, while cognitive rigidity frequently accompanies anxiety and depression. Cognitive flexibility is a health resource.
Mature intelligence tolerates "I don't know yet"“
Perhaps one of the most sophisticated phrases a human being can utter is “I don’t know yet”, said from strength, as a genuine ability to remain open while thought matures.
This requires enormous inner strength, because the ego loves quick conclusions. They provide identity, belonging, and a sense of control. But human reality is rarely binary. Relationships are complex, politics is complex, psychology is complex. Profound human truth almost never fits within a slogan. And yet, contemporary culture penalizes complexity and rewards speed.
Ambiguity is the territory of intelligence
Many people believe that doubt makes them weak. The inability to question oneself is often, in fact, a sign of psychological fragility. The most rigid minds tend to be the most threatened from within, because they need to eliminate complexity to maintain their internal stability.
Cognitively sophisticated people can do something uncommon: listen to something that contradicts their view without falling apart. They can revise ideas, modify positions, accept nuances, and change their perspective. Their identity remains firm even though it doesn't depend on being right every time.
How to train Janusian thinking in real life
This is trained physiologically and cognitively, in practice, and it almost always begins with difficult conversations.
The next time someone says something that immediately triggers your inner defenses, wait before you respond. Observe what's happening inside you. What emotion arises? What need to defend your identity emerges? What part of you wants to end it now? That brief pause is crucial, because in that interval the prefrontal cortex comes back into play, and that completely changes the quality of your thinking.
Research on emotional regulation and metacognition shows that this pause strengthens the circuits associated with self-reflection, perspective-taking, inhibition of automatic impulses, mentalization, and cognitive flexibility. This pause produces real neuroplastic change.
Deep thinking requires remaining in a state of tension.
F. Scott Fitzgerald wrote an extraordinary sentence: “"The test of a first-rate intelligence is the ability to hold two opposing ideas in the mind at the same time and still retain the ability to function."” (1936).
Most people try to escape that tension as quickly as possible. The most sophisticated minds learn to live with it because they understand something fundamental: human reality is complex. Constantly reducing it to simple certainties relieves anxiety for a moment but impoverishes intelligence over time.
Psychological sophistication doesn't scream
The most cognitively intelligent people are rarely the most dogmatic. They tend to be more curious, more open-minded, more capable of nuance and of grappling with paradoxes. They might say, “I understand both sides,” “This is more complex than it seems,” “I need to think about it,” “Some of this may be true,” “I haven’t reached a definitive conclusion yet.” In a culture obsessed with speed and reaction, this way of speaking might seem weak, and it probably reveals the opposite.
Psychological maturity preserves internal contradictions and develops sufficient nervous, emotional, and cognitive capacity to consciously sustain them without fragmenting oneself. It's about being strong and sensitive, rational and intuitive, ambitious and vulnerable, skeptical and open-minded, confident yet capable of self-questioning. It's about becoming someone who can think with complexity without losing inner presence. In an era dominated by polarization, simplification, and constant reaction, this capacity is an advanced form of psychological resilience.
Sources and references
Dennis, J.P. & Vander Wal, J.S. (2010). The Cognitive Flexibility Inventory: Instrument development and estimates of reliability and validity. Cognitive Therapy and Research, 34(3), 241-253. John Dennis and Jillon Vander Wal: clinical psychologists, researchers in cognitive therapy.
Fitzgerald, FS (1936). The Crack-Up. Esquire. Writer and novelist.
Frenkel-Brunswik, E. (1949). Intolerance of ambiguity as an emotional and perceptual personality variable. Journal of Personality, 18(1), 108-143. Psychologist, personality researcher.
Jung, CG (1967). Alchemical Studies. Princeton University Press. Psychiatrist, founder of analytical psychology.
Rothenberg, A. (1971). The process of Janusian thinking in creativity. Archives of General Psychiatry, 24(3), 195-205. Psychiatrist, researcher of the cognitive processes of creativity.
Siegel, DJ (1999). The Developing Mind: How Relationships and the Brain Interact to Shape Who We Are. The Guilford Press. Psychiatrist, a leading figure in interpersonal neurobiology.