“Sitting alone under candlelight deep into the night, I write in my diary, worrying about the nation.” 🖋️
Admiral Yi Sun-sin was the greatest commander of Joseon, establishing an unprecedented record of 23 victories in 23 naval battles during the Imjin War. What was the secret behind maintaining composure and cool-headed tactics despite court intrigue, severe imprisonment, deep grief over his fallen son, and overwhelming enemy armadas?
Every night amidst the tension of war, Admiral Yi Sun-sin lit a lamp and recorded in his diary (Nanjung Ilgi) the weather, his subordinates’ condition, the war situation, and his own raw sorrow and distress. Journaling was not merely drafting a war report; it was a self-healing and reflective ritual to confront and erase bitterness and fear, exercising calm judgment and leadership like a champion in the ring.
In today’s post, we introduce the cognitive psychological effects of Admiral Yi Sun-sin’s reflective journaling routine and a modern nightly reflective journal routine.
Historical & Academic Evidence
This content is based on Historical biography & autobiographical record examination of Admiral Yi Sun-sin & Cognitive Neuroscience research.
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Inspired by historical greats? Make it your daily habit!
1. Emotional Catharsis and Amygdala Calming Effects of Expressive Writing
When faced with negative emotions such as intense fear or feelings of injustice, the brain’s fear center, the Amygdala, becomes severely overheated. In this state, frontal lobe functions responsible for rational judgment and willpower are paralyzed. According to cognitive psychology research, ‘Expressive Writing’—the act of transferring amorphous emotional states into structured handwritten text—forcibly cools down abnormal amygdala activation. By naming emotions and aligning them with objective facts, the brain perceives previously uncontrollable situations as manageable, immediately releasing cognitive resources and demonstrating strong stress resilience.
2. 3-Step Practical Routine for Modern Professionals
Nighttime Focus Environment Setup
Late at night after completing daily work, turn off smartphones and computer monitors. Quietly open a notebook under soft lighting and sit down at your desk.
Describing Key Events, Weather, and Honest Emotions
Lightly record the detailed events (routine) and weather of the day, then write down accumulated internal fatigue, anger, anxiety, and honest emotional burdens into the notebook without filtering.
Deriving Controllable Variables and Unloading Burdens
While wrapping up the writing, clearly draw a line between 'things I cannot control' and 'one thing I can control tomorrow', relief the emotional burden, and conclude the diary.
3. Write Only Your Truth Without Caring About Others’ Judgment
To fully enjoy the emotional catharsis of a reflective journal, you must not care about others’ eyes at all. If you start refining or censoring sentences out of concern like ‘what if someone reads my diary’, the objectification mechanism that relaxes the amygdala will not function. Just as Admiral Yi Sun-sin expressed his fear, anger, and anxiety without filter through his brush, cognitive pressure is relieved only when you are thoroughly honest with yourself in the most private space meant solely for your eyes.
📌 Frequently Asked Questions (FAQ)
What should I do if I have nothing to write about daily or lack time? ▼
There is no need to write at length; even just three lines are sufficient. By summarizing 'one thing that exhausted me most today', 'my emotion at that moment', and 'one thing among them I can fix tomorrow', the brain's emotional objectification mechanism works identically.
Is typing on a smartphone diary app equally effective? ▼
In principle, analog handwriting pressed directly onto paper with a pen is most effective, as tactile feedback sending fine sensory data from the hand and arm awakens cognitive control in the frontal lobe more clearly. However, if typing while maintaining a focused state with device notifications strictly blocked and writing honestly, you can still experience sufficient emotional regulation benefits.
