Ah, the joys of spring: longer daylight, budding flowers, farm babies and, of course, opening day of our national pastime, baseball. What a thrill to go to the game and "root, root, root for the home team."

I've found that a day at the ballpark can also be very educational. In the game of life, baseball teaches us a lot of lessons. Here are a few classics:

Know what business you're in. -- Minnesota Twins Hall of Famer Harmon Killebrew once recalled playing in the yard with his father and brother. While the three were roughhousing, Mrs. Killebrew rushed toward them exclaiming, "You're tearing up the grass!"

"We're not raising grass," Mr. Killebrew replied. "We're raising boys!"

Don't assume it's as easy as 1-2-3. -- A brand-new Little League baseball coach called a friend for advice. The friend, who had coached everything from soccer to track with his kids, told him, "I always started by numbering the bases."

The new coach was surprised. "What do you mean?"

The friend explained that the first year he coached Little League, he laid out the bases and had the kids line up. "To warm up, let's have everybody jog around the bases," he said. And the first four kids took off toward third.

"Ever since," he said, "I've numbered the bases and explained that you have to run them in order. You'd be amazed at the number of kids who go from first to third by cutting across the pitcher's mound." Never assume people know what's obvious to you. Explain what they need to know.

Reputation is precious, and character is priceless. -- The great Boston Red Sox star Ted Williams was nearing the end of his career when he had a bad season due to a pinched nerve in his neck. He said he could hardly turn his head to look at the pitcher. For the first time in his career, Williams batted under .300.

At the time he was the highest salaried player in sports. The next year the Red Sox offered him a new contract for the same salary. When he received the contract, Williams sent it back with a note saying that he would not sign it until they cut his pay.

Williams said: "I was always treated fairly by the Red Sox... Now they were offering me a contract I didn't deserve. And I only wanted what I deserved."

Don't be afraid to make mistakes. -- Mickey Mantle, the great New York Yankee outfielder, once said: "During my 18 years I came to bat almost 10,000 times. I struck out about 1,700 times and walked maybe 1,900 times. You figure a ball player will average about 500 at bats a season. That means I played seven years without ever hitting the ball."

Since Mantle is regarded as one of the greatest hitters of all time, his statistics provide some perspective about the failures and mistakes that life hands us from time to time.

Don't be too quick to offer unsolicited advice. --

One afternoon when American League baseball umpire Bill Guthrie was working behind the plate, the catcher of the visiting team repeatedly protested his calls. Guthrie endured this for three innings. But in the fourth inning when the catcher started to complain again, Guthrie stopped him.

"Son," he said gently, "you've been a big help to me calling balls and strikes, and I appreciate it. But I think I've got the hang of it now. So I'm going to ask you to go to the clubhouse and show them how to take a shower."

Always remain optimistic. -- Not long ago, I stopped by a local playground to watch a Little League baseball game. I asked one of the youngsters what the score was.

"We're behind 16 to nothing," he answered.

"I must say, you don't seem discouraged," I said. "Why is that?"

"Discouraged?" said the boy, "Why should we be discouraged? We haven't even been up to bat yet."

Mackay's Moral: If you want to swing for the fences, you have to learn the rules of the game.

There is an Apache legend that the creator gave human beings the ability to talk, to run and to look at things. But in addition, the legend says he was not satisfied until he also gave them the ability to laugh. After giving humans this ability, the creator said, "Now you are fit to live."

A good sense of humor helps to overlook the unbecoming, understand the unconventional, tolerate the unpleasant, overcome the unexpected and outlast the unbearable.

Life is too short to be serious all the time. How dull our existence would be without the potential to see the lighter side of situations. And how hopeless, too! Humor often represents hope -- the idea that the worst is behind us and better things are coming.

True, not all things are funny. Knowing how and when to apply a filter is critical. And it's usually better when the joke is on you, so your obvious amusement signals permission to see the humor in a situation.

"If I were given the opportunity to present a gift to the next generation, it would be the ability for each individual to learn to laugh at himself," said Charles Schulz, creator of the long-running "Peanuts" comic strip.

April is National Humor Month. I would propose that we celebrate humor every single month, all year long. I can't imagine a day without it.

I value a sense of humor very highly when I am hiring people, especially for sales and customer service jobs. My employees know I love a good laugh. For years I started every sales meeting with a funny story or joke, and asked other managers to do the same. I wasn't looking for the next Tina Fey or Jimmy Fallon. I just wanted to loosen up the group and put them in a good mood.

The same attitude is important for anyone who comes into contact with customers. If you've ever flown on a Southwest Airlines flight, you might have heard the safety instructions delivered in a variety of amusing ways. The message is quite serious, but their approach serves a number of purposes: encouraging people to actually listen to what's being said, putting passengers in a more relaxed mood after the stress of airport hassles and letting folks know that the flight attendants are enjoying their work and want you to enjoy your trip.

Did you watch the Super Bowl? Or more specifically, did you watch the commercials? At a cool $5 million for a 30-second spot, the price tag is enough to make a business cry. But year in and year out, the ads command almost as much attention as the game itself -- because they make people laugh. And then talk about them the next day. And buy those products. Beer isn't inherently funny, nor are tortilla chips or car insurance, but, somehow, humor makes those items more memorable.

Some of the funniest people I know are also among the quietest. You have to listen closely to what they say, because the quips sneak out when you least expect them. For example, a woman approached President Calvin Coolidge, aptly nicknamed "Silent Cal," at a dinner and said, "Mr. President, I have a bet with my friend that I can get you to say more than two words." Coolidge replied, "You lose!"

You may think you have to be born funny, but I disagree. Finding the humor in everyday life is easy if you just look for it. People who take themselves too seriously are a constant source of amusement for me. Take this young job-seeker, for example:

At the end of a job interview, the human resources person asked a young engineer fresh out of a top university, "And what starting salary were you looking for?"

The engineer said optimistically, "In the neighborhood of $125,000 a year, depending on the benefits package."

The interviewer said, "Well, what would you say to a package of five weeks' vacation, 14 paid holidays, full medical and dental, company matching retirement fund to 50 percent of salary and a company car leased every two years, say, a red Corvette?"

The engineer sat up straight and said, "Wow! Are you kidding?"

And the interviewer replied, "Yeah, but you started it."

Mackay's Moral: Life isn't always funny, but a sense of humor always helps.

Departing Denver Broncos quarterback Peyton Manning's determination to win Super Bowl 50 against the favored Carolina Panthers was riveting. It reminded me of a quote he gave earlier in his career: "Being there every week for my teammates is really important to me. It's about accountability."

That's discipline, and it's rooted in little things. Isn't everything? Little things sow the seeds. The harvest comes when you can discipline yourself to routinely face life's toughest complications and frustrations. That's a crystal-clear window on the success of the oldest quarterback in Super Bowl history and the only starting quarterback to win with two different teams.

Denver's discipline shone in both directions. Wade Phillips, coordinator of the Broncos' imposing defensive machine, is the son of Bum Phillips -- the former head coach of the Houston Oilers and the New Orleans Saints, who always wore a cowboy hat. According to Bum: "The only discipline that lasts is self-discipline."

Whenever I eyeball the resume of someone applying for a management job, I look for evidence of self-discipline: As candidates have prepared themselves for past jobs, did they identify and master at least three to five key self-disciplines essential to future success?

Did the candidates stick to their routines -- even their daily exercise program -- after suffering a career setback? Dedicated self-discipliners invariably bounce back the fastest.

Does a prospective manager grasp that the self-disciplines needed by the people around her or him probably differ from the ones that bosses master themselves? Managers shore up their strengths with diverse players, not copycats of the head honcho.

Uncommonly strong self-discipline is a hallmark of success in any era. Elon Musk, who's worth a comfy $12 billion-plus, tops today's list for innovative business thinkers. He will turn 45 later this year. After co-founding PayPal, Musk masterminded the product architecture of Tesla Motors, founded SpaceX and provided the initial concept and financial capital for Solar City. Tesla Motors' battery technology has electrified the industry, if you'll excuse the figure of speech. SpaceX is redefining space travel with reusable launch components, and may one day colonize Mars.

Management guru Peter Drucker once quipped: "There is nothing so useless as doing efficiently that which should not be done at all." The relevance? Be careful about those self-disciplines you choose to hammer into habits:

-- These days, everyone is hot to develop abs of steel. Fitness training technologies have evolved like every other discipline. It pays to learn them. If you spend valuable time working up a sweat, best practices produce the premier payoff.

Roy Neuberger, who lived to be 107, made several fortunes, and thereby endowed numerous art museums. At 94, he paid a personal trainer $45 three times a week to help him through a 45-minute workout. At a buck a minute, it helped keep Neuberger spry enough to collect his National Medal of the Arts at the White House at age 104.

-- You may bust your buttons with pride about how regularly you stay in touch with your network, but are you using the cutting edge of social media to do so? Or are you still sending pals press clippings when everyone else is routing them links?

-- I have readers hooked on audiobooks: a great habit to make. If you listen on airplanes, do you also use noise-canceling headphones? A number of physicists and ear doctors point out that these more expensive headsets allow lower-volume playback, and that spares precious hearing.

Be choosy about the number of self-disciplines you adopt. You don't want to morph into a robot. Focus on doing a few well. And always remember: The only way up is up to you.

Mackay's Moral: Long-haul winners listen to their built-in drill sergeant all the way to the finish line.