Hieu Hoang

“The word “coherence” literally means holding or sticking together, but it is usually used to refer to a system, an idea, or a worldview whose parts fit together in a consistent and efficient way. Coherent things work well: A coherent worldview can explain almost anything, while an incoherent worldview is hobbled by internal contradictions. …

Whenever a system can be analyzed at multiple levels, a special kind of coherence occurs when the levels mesh and mutually interlock. We saw this cross-level coherence in the analysis of personality: If your lower-level traits match up with your coping mechanisms, which in turn are consistent with your life story, your personality is well integrated and you can get on with the business of living. When these levels do not cohere, you are likely to be torn by internal contradictions and neurotic conflicts. You might need adversity to knock yourself into alignment. And if you do achieve coherence, the moment when things come together may be one of the most profound of your life. … Finding coherence across levels feels like enlightenment, and it is crucial for answering the question of purpose within life.

People are multilevel systems in another way: We are physical objects (bodies and brains) from which minds somehow emerge; and from our minds, somehow societies and cultures form. To understand ourselves fully we must study all three levels—physical, psychological, and sociocultural. There has long been a division of academic labor: Biologists studied the brain as a physical object, psychologists studied the mind, and sociologists and anthropologists studied the socially constructed environments within which minds develop and function. But a division of labor is productive only when the tasks are coherent—when all lines of work eventually combine to make something greater than the sum of its parts. For much of the twentieth century that didn’t happen — each field ignored the others and focused on its own questions. But nowadays cross-disciplinary work is flourishing, spreading out from the middle level (psychology) along bridges (or perhaps ladders) down to the physical level (for example, the field of cognitive neuroscience) and up to the sociocultural level (for example, cultural psychology). The sciences are linking up, generating cross-level coherence, and, like magic, big new ideas are beginning to emerge.

Here is one of the most profound ideas to come from the ongoing synthesis: People gain a sense of meaning when their lives cohere across the three levels of their existence.”
― Jonathan Haidt, The Happiness Hypothesis: Finding Modern Truth in Ancient Wisdom