Commitment is something that comes from understanding that everything has its price and then having the willingness to pay that price. This is important because nobody wants to put significant effort into something, only to find out after the fact that the price was too high.
The price is something not necessarily defined as financial. It could be time, effort, sacrifice, money or perhaps, something else. The point is that we must be fully aware of the price and be willing to pay it, if we want to have success.