Nothing in our material world can come from nowhere or go nowhere, nor can it be free: everything in our economic life has a source, a destination, and a cost that must be paid
Private property is the foundation of a free market economic system. In order to utilize property in a way that best serves your needs you first have to be acquire it, and there are costs associated with the acquisition such as time, effort or money.
In addition, if you want to keep your property, or sell it to another, there are costs associated with that. Some of these costs are explicit, for example how much you paid for your car that you want to sell. Some are implicit: Now that I do not have a car, what will it cost to ride the bus?
The above notion that everything has a source, a destination and a cost is not only true of items that we purchase but also services that we consume.
It is clear that nothing appears out of thin air and is given to us all at no cost. The fact that sometimes it is hard to determine where the good came from, or how it got here or even if it is free to us does not diminish the fact it had a source, it arrived at its destination and someone paid for it.