Dr. Phil McGraw, the straight-talking psychologist-turned-talk-show-host and author of the new book Life Code, has lived long enough to see the world change dramatically since he was a child. From toxic people to technology, there's no denying that the world has evolved in significant ways over the last several decades -- and this means that people should be changing their approach along with it, Dr. Phil says.

In this clip from "Oprah's Lifeclass" with Dr. Phil, he very clearly expresses what many people around the world are feeling: that we live in a new time, within a new reality. So why would anyone continue to operate under yesterday's principles and expectations? "When the game changes, the rules change," Dr. Phil says. "When the rules change, you need a new rule book."

That rule book is exactly what Dr. Phil has written with Life Code. In the book, Dr. Phil reveals how the real world works today -- not how we wish it worked -- and pointedly exposes how you can identify the toxic and dangerous people and situations in your own life. You just need to know how the new game is played, he says.

"We need to have an urgent awareness," Dr. Phil says. "Because the world is changing. The world I was born into is not the same world that my children were born into. And now I'm a grandfather -- those children are born into a completely different world."

When Oprah asks him to explain exactly how the world has changed, Dr. Phil sums it up with one sentence: "Things are much more fast-paced," he says. "[Our kids] are seeing explicit sex scenes on network television… They can get bullied in their home in their rooms on those social chat rooms. And predators are grooming them there when they weren't grooming them there before. It's just a very different fast-paced, sophisticated world. And that means we've got to prepare ourselves and our children for that new world."

To learn how to prepare yourself, tune in to "Oprah's Lifeclass" with Dr. Phil on Sunday, April 28, at 9 p.m. ET on OWN.

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Earlier on HuffPost:

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  • Question 1

    <span style="font-size:150%">Who said, "You have to consciously create new messages to think when you start those old ones. And the new ones would be like, '... I'm allowed to feel this. This is good for my body. This is good for my soul. This is good for my relationship.' You really have to train yourself to replace those old messages with new ones, and it's actually easier than you would think"?</span>

  • Answer: Sex Therapist Dr. Laura Berman

    Back in 2009, Dr. Berman shared this advice with Luanne, a woman who said she'd never had an orgasm during her 20 years of marriage.

  • Question 2

    <span style="font-size:150%">Whose mustache did Oprah shave off during a live show in Times Square?</span>

  • Answer: Dr. Phil McGraw

    In the 10th anniversary issue of O, The Oprah Magazine, Dr. Phil advised readers to throw life a game changer every now and then. Later, in a 2010 appearance on "The Oprah Show," <a href="http://www.oprah.com/oprahshow/Expert-Advice-with-Dr-Phil-Dr-Oz-Nate-Berkus-and-Suze-Orman" target="_hplink">he let Oprah shave off his mustache</a> -- which he'd worn for 40 years!

  • Question 3

    <span style="font-size:150%">Which expert said, "So how bad is it? On a scale of 1 to 10? Maybe 1,000. And I don't say that lightly"?</span>

  • Answer: Money Expert Suze Orman

    Suze didn't sugarcoat her message to Felice, a mother of six who'd shopped her family more than $100,000 dollars into debt. Watch Oprah discuss the lesson she took from <a href="http://www.oprah.com/oprahs-lifeclass/Suze-Ormans-Advice-for-the-Mom-Who-Shopped-Her-Family-Broke-Video" target="_hplink">Felice's reality check from Suze</a>.

  • Question 4

    <span style="font-size:150%">Which expert gave the following advice: "If something brings up a bad memory or has negative energy around it, purge it, get rid of it"?</span>

  • Answer: O Creative Director Adam Glassman

    Adam shared this rule for getting rid of clothing with Oprah and viewers during an "Oprah Fridays Live!" show in 2010.

  • Question 5

    <span style="font-size:150%">Which expert said: "Time heals nothing. You can do the wrong thing for 10 years, and it doesn't equal the right thing for one day"?</span>

  • Answer: Dr. Phil McGraw

    Dr. Phil gave his take on the old adage that time heals everything during a show in 2000 on mother-daughter betrayals. Watch <a href="http://www.oprah.com/oprahshow/Dr-Phil-McGraws-Best-Moments-on-The-Oprah-Show-Video" target="_hplink">Oprah's reaction to this and other "Phil-isms</a>."

  • Question 6

    <span style="font-size:150%">During which expert's first appearance on the show did Oprah say, "That's the best damn job I ever saw," in response to his skill in helping a guest?</span>

  • Answer: Design Expert Nate Berkus

    Oprah was so impressed with <a href="http://www.oprah.com/oprahshow/Nate-Berkus-Former-Client-Thanks-Nate-for-His-Work-Video" target="_hplink">Nate's makeover of a 319-square-foot studio apartment</a> that she told her audience to remember his name back in September 2002.

  • Question 7

    <span style="font-size:150%">Which expert accompanied a viewer to her high school reunion, where they sang a karaoke duet of "Summer Nights" from the musical "Grease"?</span>

  • Answer: Design Expert Nate Berkus

    It was his first "Oprah Show" fashion renovation. In 2009, <a href="http://www.oprah.com/oprahshow/Nate-Berkus-Goes-to-a-High-School-Reunion/1" target="_hplink">Nate surprised a fifth-grade teacher</a> with a New York City makeover and then escorted her to her high school reunion.

  • Question 8

    <span style="font-size:150%">Which expert said: "We think that if we just buy the right thing, whether it's for our kids or ourselves or our home, we will acquire the life that we want -- that more is better. And it's actually simplicity. Like, happiness and abundance can be found in simplicity and actually in less"?</span>

  • Answer: Organizational Expert Peter Walsh

    Peter noticed that children always run and dance around in the empty rooms during his home decluttering projects. He shared with Oprah's audience that kids already understand that less is more. We adults have to learn it.

  • Question 9

    <span style="font-size:150%">Which expert was shirtless onstage with Oprah in 2007?</span>

  • Answer: Dr. Oz

    <a href="http://www.oprah.com/health/Your-Questions-Answered" target="_hplink">Dr. Oz stripped down to demonstrate Rolfing</a>, the technique developed by Dr. Ida Pauline Rolf to separate bound-up connective tissues that link the muscles.