From XRAYVSN …
Money is money. Yet there is one type of money that brings a smile to my face more than any other: Money gained from Passive Income.
Passive income is a self-sufficient income stream that no longer requires human capital. Human capital is initially needed. However once it reaches the top of the hill, the potential energy imparted transforms to kinetic energy and passive income is generated
It is when you are no longer a slave to money and instead it becomes your servant.