Money is just paper and pieces of metal without value, yet we can trade it for stuff we need or want. When we think of money as worthless, it is easy to give it away.
When we consciously think about what it took to get that money, it is easier to trade it for something that has real value to us. After all, we spent a great deal of our precious time earning it and that's the true value of what we buy.
Money = Our Time
When we learn to make conscious decisions about how we trade our precious time for stuff, suddenly some of those things don't seem that important anymore. Regardless of how much the marketing machines tell us otherwise being mindful of what's important will help us lead more fulfilling lives.