There is a paradox evident in those who build the great companies. On one hand, they concentrate on high-level vision and strategy while, on the other hand, they involve themselves with seemingly trivial details. The acceptance of the paradox lies in understanding that details are not trivial. Details matter. The most effective leaders are obsessed with both vision and details. They are fanatical about getting the details right.

How you deal with certain details is actually a very high level statement—a statement about the core values of the company. Involving yourself with certain details can send a very powerful symbolic message.

People have this vision of what it’s like to be an executive or CEO or leader of a huge business unit. They assume everyone at that level has enough experience and savvy to at least appear to know what they’re doing. They assume there’s thoughtfulness and strategy and long-term thinking and reasonable deals sealed with firm handshakes.

But some days, it’s high school. Some days, it’s kindergarten.

That was true when I first joined the C-suite at Philips and when I became a VP at Apple and when I was CEO of Nest and when I entered the ranks of Google execs. All these jobs felt incredibly different, but at their core the responsibilities were the same—it was less and less about what you were making and more about who you were making it with.

As CEO, you spend almost all your time on people problems and communication. You’re trying to navigate a tangled web of professional relationships and intrigues, listen to but also ignore your board, maintain your company culture, buy companies or sell your own, keep people’s respect while continually pushing yourself and the team to build something great even though you barely have time to think about what you’re building anymore.

It’s an extremely weird job.

Much to their surprise, Google discovered that the behavior of the leader does significantly matter in both the productivity of the team and the well-being of the team members. Google found that leaders from the most successful, highly rated teams all shared three common behaviors:

• COACHING: A good leader takes the time to meet with each person on the team and act as a coach, which involves both building trust with and also challenging each team member. A good leader demonstrates real care for each person and for their career development.

• EMPOWERMENT: A good leader empowers the team and avoids micromanaging — guiding and supporting the team, trusting the team to do what’s required, and providing the team with a good deal of freedom. A good leader seeks the balance of providing what the team needs to succeed while being careful to not frustrate or get in the way of the team’s functioning by managing too closely.

• LISTENING: A good leader creates an inclusive environment and shows concern for both success and well-being by listening to each team member. A good leader brings awareness to any inherent tensions between the team’s success, the company’s success, and the individual’s well-being and finds ways to resolve them and support success on all levels.

As I near the end of all of that and think back on what I’ve learned, these are the ten principles that strike me as necessary to true leadership. I hope they’ll serve you as well as they’ve served me.

Optimism. One of the most important qualities of a good leader is optimism, a pragmatic enthusiasm for what can be achieved. Even in the face of difficult choices and less than ideal outcomes, an optimistic leader does not yield to pessimism. Simply put, people are not motivated or energized by pessimists.

Courage. The foundation of risk-taking is courage, and in everchanging, disrupted businesses, risk-taking is essential, innovation is vital, and true innovation occurs only when people have courage. This is true of acquisitions, investments, and capital allocations, and it particularly applies to creative decisions. Fear of failure destroys creativity.

Focus. Allocating time, energy, and resources to the strategies, problems, and projects that are of highest importance and value is extremely important, and it’s imperative to communicate your priorities clearly and often.

Decisiveness. All decisions, no matter how difficult, can and should be made in a timely way. Leaders must encourage a diversity of opinion balanced with the need to make and implement decisions. Chronic indecision is not only inefficient and counterproductive, but it is deeply corrosive to morale.

Curiosity. A deep and abiding curiosity enables the discovery of new people, places, and ideas, as well as an awareness and an understanding of the marketplace and its changing dynamics. The path to innovation begins with curiosity.

Fairness. Strong leadership embodies the fair and decent treatment of people. Empathy is essential, as is accessibility. People committing honest mistakes deserve second chances, and judging people too harshly generates fear and anxiety, which discourage communication and innovation. Nothing is worse to an organization than a culture of fear.

Thoughtfulness. Thoughtfulness is one of the most underrated elements of good leadership. It is the process of gaining knowledge, so an opinion rendered or decision made is more credible and more likely to be correct. It’s simply about taking the time to develop informed opinions.

Authenticity. Be genuine. Be honest. Don’t fake anything. Truth and authenticity breed respect and trust.

The Relentless Pursuit of Perfection. This doesn’t mean perfectionism at all costs, but it does mean a refusal to accept mediocrity or make excuses for something being “good enough.” If you believe that something can be made better, put in the effort to do it. If you’re in the business of making things, be in the business of making things great.

Integrity. Nothing is more important than the quality and integrity of an organization’s people and its product. A company’s success depends on setting high ethical standards for all things, big and small. Another way of saying this is: The way you do anything is the way you do everything.

There are fundamentals that characterize successful enterprises and successful executives.

• They are focused.

• They are superb at execution.

• They abound with personal leadership.