Mark Manson is definitely not sugar-coating the truth in his hit book "The Subtle Art of Not Giving a F*ck". For example, he tells you that there is no way your life or your career can be struggle-free. In fact, he says problems are necessary as a way to make us stronger - and make our life more interesting.

His book is full of useful strategies that will help you turn your life around. So, if you haven't read it, you better run to the closest library.

But, if you want to get a sneak peek at valuable thoughts the author has to offer, here are some surprising quotes to inspire you.

"Life is about not knowing and then doing something anyway. All of life is like this. It never changes. Even when you're happy. Even when you're farting fairy dust. Even when you win the lottery and buy a small fleet of Jet Skis, you still won't know what the hell you're doing. Don't ever forget that. And don't ever be afraid of that."

When we're children, we think that grownups always know what they are doing. But then we grow up and realize that they don't have a clue. However, it doesn't mean that you should be afraid of life because of that, as Mr. Manson says.

"Our most radical changes in perspective often happen at the tail end of our worst moments. It's only when we feel intense pain that we're willing to look at our values and question why they seem to be failing us. We need some sort of existential crisis to take an objective look at how we've been deriving meaning in our life, and then consider changing course."

This is one of the truest things ever written. Profound change doesn't happen when you are happy and satisfied, but rather when you are at your worst. Embrace those bad moments because they can lead to the biggest improvements in your life.

Here's more from him on that:

"When it comes down to it, if you feel crappy it's because your brain is telling you that there's a problem that's unaddressed or unresolved. In other words, negative emotions are a call to action. When you feel them, it's because you're supposed to do something. Positive emotions, on the other hand, are rewards for taking the proper action. When you feel them, life seems simple and there is nothing else to do but enjoy it. Then, like everything else, the positive emotions go away, because more problems inevitably emerge."

And you know how people keep telling you to find yourself and understand who you are? Well, here's what Mark Manson has to say about that:

"I say don't find yourself. I say never know who you are. Because that's what keeps you striving and discovering."

Discovering yourself is a journey and not something to get over in your 20's. You change and you will continue to change throughout your life. You will always have something new about yourself to discover, and there's nothing wrong with that.

"Breadth of experience is likely necessary and desirable when you're young - after all, you have to go out there and discover what seems worth investing yourself in. But depth is where the gold is buried. And you have to stay committed to something and go deep to dig it up. That's true in relationships, in a career, in building a great lifestyle - in everything."

Investing time in something and going deeper to learn about it is what will actually help you find what you are looking for. But keep in mind, this means investing time and effort in things that really matter.

And finally, here's something Mark Manson wants you to remember:

"Maturity is what happens when one learns to only give a fuck about what's truly fuckworthy."