Getting rich is entirely up to you. Rasstock/Shutterstock Prompted by legendary businessman Andrew Carnegie, who turned a few nickels and dimes into a fortune, journalist Napoleon Hill researched more than 500 self-made millionaires over 20 years before releasing his 1937 best-seller "Think and Grow Rich."

In addition to boiling down the "secret" to building wealth in 13 principles, he revealed 30 "major causes of failure" that hold many of us back from getting rich.

Here are 17 that are still relevant today.