If you want something badly enough, you can find the means to get it.
where there's a will, there's a way
If one really wants to do something, one can. For example, Max has no idea of how to get the money to repair his boat, but where there's a will. This proverb was stated slightly differently in 1640 (To him that will, ways are not wanting) but has been repeated in its present form since the early 1800s. It is so well known it is often shortened, as in the example.