If I could only share one piece of personal finance advice to grads or to just about anyone, it would be this:

Only borrow money to pay for things that increase in value.

It’s a short list: your business, your house and your education, mostly. Stocks if you’re smarter than me. That’s pretty much it.

If you have credit card debt, you’re in big trouble. Your bank account has a huge leak in it, and it’s getting worse. Hence the urgency.

If you have credit card debt, that means that every time you spend money (even cash), you’re borrowing money to do so. And so, if you’re going out to dinner or buying a new pair of shoes, you’ve just broken the single most important rule of personal finance. You’re spending borrowed money on stuff that is decreasing in value.

This is an emergency. It’s an emergency because every single day you wait, the problem gets worse. A lot worse.

My suggestion: Go to defcon 1, and do it immediately. Shift gears to live well below your means. That means:

No restaurants

No clothes shopping

No cable TV bill

No Starbucks

It means:

Take in a tenant in your spare bedroom

Carpool to work

Skip vacation this year

Eat brown rice and beans every night for dinner. Act like you have virtually no income.

The result? You’ll save $5,000 to $20,000 a year. Send all of it to the credit card company. Do this until you’re debt free, the faster the better.

There. Now you’re rich. Now you get interest on your savings instead of paying the bank. Twenty years from now, this emergency action will translate into perhaps a million dollars in the bank, depending on how much you earn and how serious you are.

You can thank me then.