- Freedom: when you are full in debt, you are doing something that you don't really want to do, but need to. Therefore debt takes your freedom away.
- Cash Flow: well, this one is obvious. When you are in debt, you don't have enough liquid assets, such as cash, to pay for your expenses.
- Opportunities: when various financial opportunities arise, you are not able to take the full control of it, due to you debt.
- Time: you loose your time to work in order to repay the loans, when you could be doing anything else in the world.
In conclusion, it's all about the opportunities cost - what you loose when you have a debt.