This is a powerful quote from a man who took over much of the world in europe and north africa. It is interesting that he would have something so wise because he lost in the end and was punished for invading nations that did not belong to him by being put in a prison on an island for his whole life. But in his time what he did was definitely impossible so the quote still rings true.
He was a violent bad man though so we should just take this lesson on its own and not follow his path but rather a path of goodness where you do not let anything stand in your way. Nothing is impossible and you can find possibilities in every situation.
https://www.brainyquote.com/quotes/napoleon_bonaparte_108865