Your mistaking his message. Most people cannot buy a house or even buy property in cash but if you do, you would be foolish to put it all down at once. If you instead invest in that money, you will make more back in interest than you will spending on interest to your mortgage. Now a mortgage is still debt, so yes you want to pay it off as quickly as possible but investments come first. Checkout his 7 baby steps:
http://https://www.everydollar.com/b...asy-baby-steps