We have an obligation to ourselves to become all we can be; at a minimum. As such, we must clear up a common misconception: Willpower and self-discipline are dissimilar. The distinction is critical: Conflating willpower with self-discipline is the main reason most people fail to build lasting habits. At this point, you might be thinking, “What’s the problem?” This: A staunch reliance on willpower, a finite resource, instead of building a system of discipline, is a structure that cannot stand. It may work initially, but the foundation won’t last.

Every decision you make, every temptation you resist, and every suppression of emotion is an exertion of willpower.

From a strictly psychological perspective, the constant reliance on willpower leads to ego depletion. The reason for this? Willpower is usually described as a limited cognitive resource, and if you use it long enough, it becomes fatigued. Willpower is an active, conscious effort to override an impulse or emotion; i.e., you are basically fighting yourself to get things done. Think about it: Your day may be a battle of wills. You may have spent the day summoning the strength to have that difficult conversation, enduring that meeting where the boss only focuses on the negative, and sitting in traffic for an hour after a 12-hour shift. What if every day is like this? What then?

Every decision you make, every temptation you resist, and every suppression of emotion is an exertion of willpower. Strict reliance on willpower puts you in a state where you are constantly forced to defeat your own impulses. It’s exhausting, and this is where ego depletion comes in: You are basically in a constant state that requires you to push yourself to get through.

Conversely, self-discipline ends in habit formation and a shift in identity. From a psychological standpoint, self-discipline doesn’t require you to fight against yourself or your impulses to get things done. It is not about fighting at all; it is about designing your environment and identity so that decisions become second nature—you do things even when you don’t feel like it. With self-discipline, the right action becomes the path of least resistance, and having a bias for action is your identity.

Self-discipline relies on automaticity. Through repeated effort, behaviors move from demanding conscious effort to the currency of habit, while needing little cognitive energy. As such, decision fatigue is eliminated, and all decision-making processes are bypassed. You don’t decide to write for 90 minutes; you write for 90 minutes because you are a writer. Self-discipline removes the need for decision-making; everything becomes automatic. This transforms “I have to…” into “I am the kind of person who….” It’s an identity shift that leads to identity-based action.

Identity bridges the gap between psychological willpower and discipline. When your actions are aligned with your identity, psychological friction disappears. You don’t resist the urge to skip writing; the urge to skip doesn’t exist because it’s contrary to who you are.

Where does that leave you? To fulfill your “obligation to yourself,” you must shift from the tedium of constant willpower to discipline-building.

Here are some tips:

• Remember: Willpower is a backup, not a strategy.
• Lean into discipline because you won’t always feel like doing the hard or even the easy thing.
• Consider environment design; e.g., if you want to eat a healthful diet, place healthy food choices where they are accessible, e.g., fruit in a bowl on the table. Make poor decisions harder; e.g., don’t buy junk food or sugary snacks.
• Post a sticky note on your truck’s dashboard with an identity statement, e.g., “I am a focused entrepreneur.”

Don’t try to conquer each day through sheer force of will; this will lead to eventual burnout and ego depletion. Instead, take an architectonic approach—design a life where the right choices become fluid and are the easiest choices to make. Tap into the power of habit. After all, as Aristotle stated: “We are what we repeatedly do. Excellence, then, is not an act, but a habit.”

Comparing the Psychological Mechanics of Willpower & Discipline