“The only thing that really mattered is my character, and how does it interact with other people.” — Stan McChrystal

General Stan McChrystal has led elite forces in combat, commanded coalition efforts in Afghanistan, and now advises Fortune 100 companies. [I served as his senior adviser in Afghanistan in 2009-10.] But when he sat down with me to talk about his new book, what he wanted to talk about wasn’t strategy, operations, or metrics.

It was character. That’s the subject of his latest book, On Character.

Conviction × Discipline = Character

Stan offers a simple but powerful equation:

Character = Conviction × Discipline

Conviction, he explains, means deeply held beliefs that have been pressure-tested and chosen, not inherited uncritically. Discipline is the self-mastery of acting consistently in alignment with one’s convictions.

This model led to a matrix that any CEO should reflect on:

• High conviction, low discipline = ineffectual idealism.
  
  “They believe in the right things, but don’t have the courage or discipline to act,” Stan says. Think of the hand-wringing bystanders Dr. King called out from a Birmingham jail.
  
• Low conviction, high discipline = dangerous ambition.
  
  These are the sharks, disciplined, relentless, and empty of values. “It’s almost amoral. Not immoral, but amoral,” Stan cautions. Too many political and business leaders fall into this quadrant, driven by efficiency and optics rather than principles.
  
• Low conviction, low discipline = rudderless drift.
  
  “Unguided missiles,” as Stan put it. They’re not actively harmful; just not helpful. As he noted with a chuckle, “Even dead fish go with the flow.”
  
• High conviction, high discipline = the ideal… with a caveat.
  
  “You don’t want to be the Taliban,” he warns. Even Hitler, Stalin, Pol Pot, and others had high discipline and conviction, just toward evil ends. Our challenge, then, is to pursue good values with rigor, while remaining open-hearted and open-minded.

Why This Matters for CEOs Today

You’re not just leading a company. You’re shaping culture, inside and outside your organization.

Stan pulls no punches here: “We’re in an era where we are celebrating a lack of character… We know they’re lying. They know we know. But we accept it because we think that’s just how the game is played.”

That’s not leadership. That’s surrender.

The antidote is character-based leadership, not as performance, but as culture. Your hiring, development, strategy, and customer relationships should reflect your north star. “Business leaders have a vital role in society,” Stan told me. “They are not external to it.”

If you don’t define your strike zone, your core virtues, your standards, or your boundaries, someone else will. Or worse, no one will, and entropy will take over.

Striking the Balance: Beyond Performative or Passive

We discussed the business implications of the strike zone. You can identify examples of acceptable conduct that belong in the strike zone and behaviors that fall outside of it.

Having clear balls and strikes builds character into your company’s DNA. Define your core convictions. Hire and promote people who live them. Design systems and rhythms to reinforce the habits that reflect who you want to be.

Character, after all, isn’t what you say in your values statement. It’s the default behavior when no one’s watching.

Bouncing Forward

Toward the end of our conversation, Stan reflected on the aftermath of his resignation in 2010. 

“I was prepared for the moment,” he said. “What I wasn’t prepared for was what came after. History didn’t end.”

He rebuilt, starting a business, teaching at Yale, and writing books. But he didn’t do it alone.

“I had so many people pulling for me,” he told me. “More than I ever imagined. At first, I felt disgraced. Alone. But that wasn’t true.”

It reminded me of one of the most underappreciated dimensions of character: trusting relationships. The goodwill we build over time by showing up with integrity pays dividends when things go sideways.

Stan’s wife Annie played a vital role. So did old friends and teammates. And he kept moving forward, looking at life through the windshield instead of the rearview mirror – trying new things, and showing resilience through massive life transitions.

If you’re leading a company, you’re going to have tough quarters, maybe even years. But when you’ve led with character, you won’t have to face them alone.

Final Word: Leadership Starts with You

Aristotle said character is habit. Stan says it’s discipline. They are both right; habit is the expression of discipline. You forge your character daily in how you lead meetings, give feedback, handle crises, and treat people.

How you handle adversity reveals your character.

Towards the end of the book, Stan discusses heroes. To him, a hero is not defined by a solitary act, but by how you show up over the long haul through adversity in service to others.

He’s been a hero to me and many others, and I’m proud to call him a friend and mentor.

Check out his new book, On Character, a must-read for anyone serious about leading well.