...(in the army) you're forced to learn the most important lesson in life, and that's the fact that you have to live up to your responsibilities, and you better do it right. When given an order, you can't say no. It's no exaggeration to say that lives are on the line. One wrong decision, and your buddy might die. It's this fact that makes the army work. That's the big mistake a lot of people make when they wonder how soldiers can put their lives on the line day after day or how they can fight for something they may not believe in. Not everyone does. ...but when all is said and done, we do what we do for one another. For friendship. Not for country, not for patriotism, not because we're programmed killing machines, but because of the guy next to you. You fight for your friend, to keep him alive, and he fights for you, and everything about the army is built on this simple premise.

The army influences everything I do. Certainly it teaches you discipline, which is a necessary element of development. I think there's more of a collaborative understanding in the band because of that.

That day, and so many others when I served, illustrated the two most important lessons the military taught me: Never leave anyone behind—not on the battlefield and not in our country. And never put a service member in harm’s way without understanding the cost—the very real and very human cost—of war.

Looking back on my 34-year Army career, you could really sum it up in two words- caring and serving. I served in defense of the country that I love, and I served people. And I learned a lot by doing both. At the end of the day, I can look back and say that I was a good soldier, a very good troop. And I am fiercely proud of that. The Army provided me an opportunity to be all that I could be, and I think I took full advantage of that opportunity. A famous writer and poet once said that the purpose of life is to count, to have made a difference that you lived at all." I sincerely believe that I contributed and that I made a difference while in the Army. I also believe that I am still making a difference in the lives of others by caring and serving. At the end of the day, that's what life is really all about.

The most important lesson that came out of Vietnam for me was that Marines take care of Marines.

I learned about the strength you can get from a close family life. I learned to keep going, even in bad times. I learned not to despair, even when my world was falling apart. I learned that there are no free lunches. And I learned the value of hard work.

Many times I have been grateful for the simple, military skill of being able to live with people in confined spaces. It has helped me so much over the years on expeditions and beyond. And I was especially glad to be with Neil.
When we hang with good people, some of their goodness rubs off. I like that in life.
The other thing the army had taught me was how, and when, to go that extra mile. And the time to do it is when it is tough — when all around you are slowing and quitting and complaining.
It is about understanding that the moment to shine brightest is when all about you is dark.
It is a simple lesson, but it is one of the keys to doing well in life. I see it in friends often. On Everest that quality is everything.

Four things to learn in life: To think clearly without hurry or confusion; To love everybody sincerely; To act in everything with the highest motives; To trust God unhesitatingly.

[W]e must profit by the lessons of the war. ... [T]he first lesson it has taught is the immense importance of maintaining the solidarity of the British Empire. (Cheers.) It has rendered a service to humanity the magnitude of which will appear greater and greater as this generation recedes into the past. ... This Empire has never been such a power for good. To suggest that such an organization could fall to pieces after the war would be a crime against civilization. ... The British Empire will be needed after peace to keep wrongs in check. Its mere word will count more next time than it did the last. For the enemy know now what they have got to deal with.

It is not too much to say that when the Great War broke out our Generals had the most important lessons of their art to learn. Before they began they had much to unlearn. Their brains were cluttered with useless lumber, packed in every niche and corner.

The coup gave them a chance to put into practice what they had learned in their barracks: blind obedience, the use of arms, and other skills that soldiers can master once they silence the scruples of their hearts. (p436)

Some of the most important lessons I have learnt over the years in the course of my career include to be true to myself, live, learn and love.

Somewhere about 1893 I started teaching Scouting to young soldiers in my regiment. When these young fellows joined the Army they had learned reading, writing, and arithmetic in school but as a rule not much else. They were nice lads and made very good parade soldiers, obeyed orders, kept themselves clean and smart and all that, but they had never been taught to be men, how to look after themselves, how to take responsibility, and so on. They had not had my chances of education outside the classroom. They had been brought up in the herd at school, they were trained as a herd in the Army; they simply did as they were told and had no ideas or initiative of their own. In action they carried out orders, but if their officer was shot they were as helpless as a flock of sheep. Tell one of them to ride out alone with a message on a dark night and ten to one he would lose his way. I wanted to make them feel that they were a match for any enemy, able to find their way by the stars or map, accustomed to notice all tracks and signs and to read their meaning, and able to fend for themselves away from regimental cooks and barracks.

I worked hard all my life and always expected those who worked for me to do likewise. But I tried not to generate make-work. I learned early that a complete life includes more than work. We need family, rest, outside interests, and time to pursue them. I always keep in mind a lesson taught to all young infantry lieutenants: “Don’t run if you can walk; don’t stand up if you can sit down; don’t sit down if you can lie down; and don’t stay awake if you can go to sleep.