I retired at 37 as a self-made millionaire, and I can tell you 99% of the advice you hear on getting rich can be boiled down into 2 rules

Courtesy of Chris Reining

Chris Reining.

• Chris Reining retired at age 37 as a self-made millionaire.
• He writes that he used to be overwhelmed by the process of building wealth, feeling like he couldn't get ahead.
• Then, he rewired his mindset to embrace two rules: Spend what's left after investing, and make big purchases small.
• When people tell him they "want to be rich," he shares those two rules that worked for him.

In 1956 Warren Buffett was managing about half a million dollars. He was working from a tiny study that could only be entered by passing through his bedroom.

He handled everything personally: typing letters on an IBM typewriter, filing paperwork, doing taxes. And nowadays he's one of the wealthiest people in the world.

This got me thinking about what it means to be resourceful. That if being resourceful can put you on the path to riches, why aren't more people resourceful?

You probably hear people complaining they can't save money or they're not making as much as they'd hoped or they'll never have enough money to retire.

But isn't being rich about being resourceful, just a mindset? Here, let me show you.

Person A: "I've tried everything."
Person B: "I asked someone to mentor me."

Person A: "I bought a $30,000 car."
Person B: "I bought a $10,000 car."

Person A: "I'll charge it to the credit card."
Person B: "I can't afford it."

Person A: "I don't know how to start investing."
Person B: "I borrowed some books from the library."

Person A: "I don't have the money."
Person B: "I found the money."

It's usually not the lack of resources available, it's the lack of resourcefulness that stops you, from reaching your financial goals.

And how do I know this? I used to be like Person A, just going with the flow, complaining how it's impossible to get ahead.

Read More: I retired at 37 as a self-made millionaire, and seeing how little it costs to live now makes me think differently about money and happiness

It wasn't until I started changing my mindset, rewiring my thinking, that I became more resourceful like Person B. It's how you get rich.

And sure, what worked for me might not work for you, but I can tell you that 99% of advice you hear about getting rich can be compressed into two rules.

Rule 1: Spend what's left after investing

It's popular to say, "I want to be rich."

People tell me that all the time, and so I tell them the easiest way to get rich is to spend what's left after investing.

They tell me that's impossible, and so the advice doesn't apply to them.

Yes, I know there are exceptions, but what they're saying is every single thing in their standard of living is more important than what they say they want.

The simple solution? Take a percentage of your income, say 5%, and have it automatically invested. You'll quickly adjust to living on less.

And over time you can increase the amount you invest to 10%, 15%, even more. According to The Millionaire Next Door the average millionaire invests 20% of their income.

This is how normal people become rich, because they understand one thing: small and seemingly insignificant sums of money, invested over long periods of time, can make you rich.

It takes a long time to get rich this way, but you'll feel like a genius when you finish.

Rule 2: Make big purchases small

A big reason people struggle to save 10% or so of their income is they buy houses and cars they can't afford.

Of course, people hate hearing they can't afford something. It's threatening to their ego.

A friend who owns a Toyota Camry once told me they were tired of being surrounded by Range Rovers when dropping the kids at daycare.

"I'm a successful lawyer!"

Read More: I retired at 37 as a self-made millionaire - here's the one-sentence secret to financial independence

The social pressure got to them, and so now they're financing a $75,000 SUV, paying $2,000 per month between the loan, insurance, and gas.

They're now saying they can't afford to save for retirement.

The same goes for a house. Just because a bank will lend you half a million dollars for a house doesn't mean you need to purchase a half million dollar house.

Look, I'm not saying don't buy the things you want, what I'm saying is the reason people don't have bigger bank accounts is that spending beyond your means is probably as old as money itself.

It's easy to go with the flow, valuing what society tells you to value. Usually that leads to overspending, to not investing for your future.

And if you can counteract these tendencies it's relatively simple to get rich. Be resourceful, spend what's left after investing, and don't buy things you can't afford.

Chris Reining retired from corporate America at 37, and is now an investor, student of life, and writer - though not in that order. You can read more at chrisreining.com.