The Last Fruit: What Galatians 5 and the Neuroscience of Self-Control Reveal About Every Athlete Who Has Ever Quit a Set Too Early
By Eric Johnson | CrossFit Full Armor | CrossFit Gym in Raleigh, NC
Faith-Based Fitness Raleigh | CrossFit Raleigh | Strength Training Raleigh NC
“But the fruit of the Spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control. Against such things there is no law.” — Galatians 5:22–23
Paul lists nine fruits of the Spirit in Galatians 5. Self-control is last.
That placement is not accidental. In the ancient rhetorical tradition, the final item in a list carries special weight — it is the destination the list has been building toward, the capstone that holds everything else in place. Love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness — all of these are possible in their fullest expression only when self-control is present. Without it, love becomes impulsive. Joy becomes undisciplined. Kindness becomes inconsistent. The other eight fruits require the ninth to sustain them.
Exercise science arrived at an equivalent conclusion through a completely different route. The research on athletic performance, training consistency, and physical development converges on a single finding that the ancient world would have recognized immediately: the capacity for self-control — what neuroscientists call inhibitory control — is the most predictive psychological variable in all of sports performance. More predictive than motivation. More predictive than talent. More predictive than competitive drive or pain tolerance or training volume.
The athlete who governs themselves governs their performance. The one who cannot govern themselves cannot govern their results, regardless of how gifted they are.
What Inhibitory Control Actually Is
Inhibitory control is the brain’s capacity to suppress an impulse in favor of a better response. It is the neurological mechanism that allows an athlete to keep moving when the body is signaling stop, to hold position when instinct says retreat, to maintain form when fatigue is eroding the motor pattern, and to stay present in the work when the mind is already calculating how much is left.
The prefrontal cortex — the region of the brain most associated with planning, decision-making, and impulse regulation — is the primary seat of inhibitory control. It operates in constant tension with the limbic system, which generates the emotional and physical urgency responses that feel like genuine signals but are often premature. The limbic system generates the urge to drop the bar. The prefrontal cortex evaluates whether that urge is justified. The athlete’s performance in any given moment is largely determined by which system wins that evaluation.
Research published in the Journal of Sport and Exercise Psychology has consistently shown that athletes with higher inhibitory control scores — measured through standardized cognitive tasks — demonstrate better performance under pressure, more consistent pacing in endurance events, higher tolerance for discomfort during maximal efforts, and better decision-making in high-fatigue states. They do not feel less. They govern the feeling more effectively.
Self-control is not the suppression of sensation. It is the governance of response. The body still sends every signal. The difference is what the athlete does with it.
The Ego Depletion Problem
In 1998 psychologist Roy Baumeister published research that introduced a concept he called ego depletion — the idea that self-control operates like a muscle that fatigues with use. The more decisions and impulse-suppressions a person makes across a day, the less cognitive resource remains for subsequent self-control demands. An athlete who has been making difficult choices and managing stress all day arrives at a training session with a depleted inhibitory control reserve — and that depletion shows up in the quality of their effort, their willingness to push into discomfort, and their ability to maintain standards when fatigue arrives.
The research on ego depletion in athletic contexts is consistent. Athletes tested on self-control tasks before training demonstrated lower performance on subsequent physical tasks than athletes who were not depleted. The physical capacity was identical. The governing mechanism was compromised. The result was worse performance from the same body.
This finding has enormous practical implications for anyone who trains after work, after school, or after a day of managing significant cognitive and emotional demands. The fatigue you feel walking into the gym at 5:30pm is not only physical. It is neurological. Your inhibitory control reserve is lower than it was at 8am. Your prefrontal cortex is less able to govern the impulse to stop, to scale back, to find a reason to make the next set easier. The training session is harder to execute well not because your muscles are weaker but because the governing system is depleted.
Paul’s instruction to cultivate self-control as a fruit of the Spirit — something grown over time through consistent practice rather than summoned on demand — anticipates this finding. A self-control capacity that is developed deeply enough becomes more resilient to depletion. The athlete who has practiced governing their impulses consistently, across years of training and living, draws from a deeper reserve than the athlete who relies on motivation and willpower in the moment.
The Rep You Quit Too Early
Every athlete who has trained seriously knows the specific experience Galatians 5:23 is speaking to, even if they have never connected it to scripture. It is the rep that ended two reps before failure. The set that stopped when the discomfort became significant rather than when the capacity actually ran out. The workout that was scaled down not because the prescribed weight was unsafe but because the governed response to fatigue was not yet developed enough to distinguish genuine limitation from premature signal.
Exercise scientists call this phenomenon the rate of perceived exertion gap — the difference between how hard an effort feels and how hard the effort actually is relative to the body’s true capacity. Research consistently shows that athletes with higher inhibitory control are better at calibrating this gap. They are not immune to perceived exertion — they feel the discomfort as acutely as anyone else. But they are better at evaluating whether the signal justifies stopping, and they are more likely to continue past the point where the untrained governing response would have ended the effort.
This calibration is trainable. It is not a fixed trait that some athletes have and others do not. It is a capacity that develops through repeated practice of exactly the thing that feels most difficult — continuing past the first signal to stop, then the second, then learning where the genuine limit actually lives. Every training session that ends one rep later than the impulse demanded is a session that develops the governing capacity. Every session that ends when the impulse wins is a session that reinforces the impulse.
The rep you almost quit is the most important rep in the set. It is where the governing capacity is actually being built. Everything before it is preparation.
Self-Control and the Long Game
The fruit of the Spirit is not produced in a single season. Paul’s agricultural metaphor in Galatians is deliberate — fruit grows over time, through consistent cultivation, in conditions that must be maintained rather than forced. Self-control as a spiritual fruit is not a decision made once. It is a capacity developed through the same mechanism that builds every other meaningful athletic quality: consistent practice under progressively increasing demand, across enough time for the adaptation to fully mature.
The neuroscience confirms this exactly. Inhibitory control is not only a cognitive capacity — it has a physiological substrate. The prefrontal cortex develops structurally in response to the demands placed on it, in the same way muscle develops in response to the demands of training. Athletes who consistently practice governing their impulses — in training, in competition, in the choices of daily life — demonstrate measurable differences in prefrontal cortex volume and connectivity compared to athletes who do not. The governing capacity is literally built into the structure of the brain over time.
This is the athlete Paul is describing in Galatians 5. Not someone who suppresses their impulses through gritted teeth and sheer willpower in the moment. Someone whose capacity for self-governance has been developed so deeply, over enough time, that it operates with something closer to grace than effort. The fruit is the evidence of the cultivation. It does not arrive before the growing season has run its course.
What This Looks Like in the Gym
At CrossFit Full Armor in Raleigh, we see the self-control variable play out every session. It is visible in the athlete who maintains movement standards when the load gets heavy and the rep count is high. In the member who arrives depleted from a hard day and trains anyway — not as an act of self-punishment but as a practiced commitment to something they decided about before the session started. In the person who scales a workout intelligently rather than heroically — making the governing decision that leads to better long-term development rather than the impulsive decision that leads to a good story and a compromised training session.
The benchmark system we run here is, among other things, a self-control development tool. Retesting a named workout requires the athlete to govern the impulse to pace differently, to make the effort consistent with previous attempts, to evaluate performance honestly rather than through the distorting lens of how the session felt. The record on the sheet is the governing document. The athlete’s job is to be governed by it.
Self-control is the last fruit. It holds the others in place. And in the gym, it holds your training in place — protecting the quality of every session from the impulse to make it easier than it needs to be, and protecting the quality of every season from the drift that happens when governing capacity is never developed.
Cultivate it. It is worth the growing season.
Against such things there is no law. And in the gym, there is no substitute.
Train at CrossFit Full Armor — Raleigh’s Faith-Centered CrossFit Gym
4312 Lead Mine Rd, Raleigh, NC 27612
— Eric Johnson, CrossFit Full Armor