Why You Should Not Pay Off Your Mortgage

Source: Forbes — 

I’ve been investing in real estate for over 15 years, but at the beginning, like most people, I immediately began trying to pay off my mortgage, figuring the quicker I got rid of the debt, the better. Then, I finally realized something that has revolutionized the way I thought about my investment strategy. This epiphany has set me on a course to financial freedom that is far more productive and successful than just being free from debt.

What was my sudden realization?