17 insights about getting rich, from a 78-year-old book on wealth that's still relevant today

Journalist Napoleon Hill set out to uncover the key to wealth around 80 years ago, which resulted in his bestselling 1937 book, "Think and Grow Rich." 

There is no mention of "money," "wealth," "finances," or "stocks" within Hill's text.

Rather, he focuses on breaking down the mental barriers that prevent many of us from attaining our own fortunes, an approach which is still relevant today. 

We scoured Hill's pages to come up with some of his best insights about wealth, power, success, and overcoming the psychological barriers needed to achieve them.

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"Before success comes in any man's life, he is sure to meet with much temporary defeat, and, perhaps, some failure. When defeat overtakes a man, the easiest and most logical thing to do is to quit. That is exactly what the majority of men do."

"You may as well know ... that every great leader, from the dawn of civilization down to the present, was a dreamer."

"If the thing you wish to do is right, and you believe in it, go ahead and do it!"