7 steps to get rich, from a 90-year-old book on wealth that's still relevant today

2. 'Control thy expenditures.'

The next step is to simply spend less than you earn, which is easier said than done. Our consumer-driven society makes it incredibly easy to overspend — and what's more, when income increases, people have a tendency to boost their spending. It's called "lifestyle inflation."

"What each of us calls our 'necessary expenses' will always grow to equal our incomes unless we protest to the contrary," Arkad explains. "Confuse not the necessary expenses with thy desires."

To control your expenses, you have to become a conscious spender and recognize where your money is going. A good starting point is to record all of your purchases (whether in a notebook, through an app like Mint, or on an Excel spreadsheet) and analyze your spending patterns.

"Study thoughtfully thy accustomed habits of living," Arkad says. "Let thy motto be one hundred per cent of appreciated value demanded for each coin spent." Even if you're well on your way to accumulating a fortune, the habit of living below your means still applies. There are a surprising number of frugal billionaires who choose to save or give to charity, rather than drop their money on jets, yachts, and mansions.

3. 'Make thy gold multiply.'

Once you've made a habit out of controlling your expenses and setting aside at least 10% of your income, put that money to work.

"The gold we may retain from our earnings is but the start," says Arkad. "The earnings it will make shall build our fortunes ... Learn to make your treasure work for you. Make it your slave. Make its children and its children's children work for you."

Making your money your "slave" is the modern-day equivalent to smart investing through your employer's 401(k) plan or other retirement accounts, such as a Roth IRA or traditional IRA. Thanks to compound interest, your savings can grow tremendously over time — the trick is to set aside money regularly and to start as early as possible.

"Behold, from my humble earnings I had begotten a hoard of golden slaves, each laboring and earning more gold," explains Arkad. "As they labored for me, so their children also labored and their children's children until great was the income from their combined efforts."

4. 'Guard thy treasures from loss.'

There is always going to be a level of risk involved in investing, which is why it's crucial to be smart about where you invest your money.

"The first sound principle of investment is security for thy principal," says Arkad. "Is it wise to be intrigued by larger earnings when thy principal may be lost? I say not. The penalty of risk is probable loss. Study carefully, before parting with thy treasure, each assurance that it may be safely reclaimed. Be not misled by thine own romantic desires to make wealth rapidly."

Investing is a long term game and the "get rich quick" mindset will only set you back. As legendary investor Warren Buffett likes to say, "It's pretty easy to get well-to-do slowly. But it's not easy to get rich quick."

If can be tricky to figure out the best way to invest your money, but you don't have to go at it alone. There are financial planners, wealth advisers, and robo-advisers to guide you. There is also an abundance of accessible information out there if you want to be a more hands-on investor. Check out some of our favorite books and podcasts that cover investing basics, strategies, and tips.

"Consult with wise men," advises Arkad. "Secure the advice of those experienced in the profitable handling of gold. Let their wisdom protect thy treasure from unsafe investments."

5. 'Make of thy dwelling a profitable investment.'

"I recommend that every man own the roof that sheltereth him and his," Arkad tells his class on the fifth day. "Nor is it beyond the ability of any well-intentioned man to own his home."

Today, this topic is heavily debated, and there is no one, universal answer to the buying or renting question — however, Arkad argues that, "to own his own domicile and to have it a place he is proud to care for, putteth confidence in his heart and greater effort behind all his endeavors."

Of course, before investing in a home, you'll want to know how much you can afford and be financially prepared for the myriad of hidden costs that come with buying a home.

6. 'Insure a future income.'

"The life of every man proceedeth from his childhood to his old age," says Arkad. "Therefore do I say that it behooves a man to make preparations for a suitable income in the days to come, when he is no longer young, and to make preparations for his family should he be no longer with them to comfort and support them."

Today, we call "the days to come" retirement. Time is your biggest asset when it comes to investing in retirement accounts — thanks to compound interest — so the earlier you can start saving for retirement, the better off you'll be.

As far as making preparations for your family upon your death, or should you be in some way disabled, we now have insurance policies for these situations that you may want to consider: life, disability, and long-term care.

Read up on how to ensure your wealth lasts a lifetime.

7. 'Increase thy ability to earn.'

"The more of wisdom we know, the more we may earn," preaches Arkad. "That man who seeks to learn more of his craft shall be richly rewarded."

Rich people choose to constantly learn and grow — they would rather be educated than entertained, even after they've attained incredible success. Take Warren Buffett, for example, who estimates that 80% of his working day is dedicated to reading.

"Cultivate thy own powers, to study and become wiser, to become more skillful, to so act as to respect thyself," says Arkad. "Thereby shalt thou acquire confidence in thyself to achieve thy carefully considered desires."

Today — with such a wealth of books, podcasts, and online resources out there — it's easier than ever to self-educate.